Perimeter of semicircle and triangle. Perimeter is the distance around a two-dimensional shape.

Perimeter of semicircle and triangle May 14, 2025 · Whether you're looking to calculate triangle properties, find the circumference of a circle, or get help with polygon dimensions, this Perimeter Calculator brings together essential geometry tools in one simple interface. BC=CA=6cm. 4 or 19. For today’s topic we are going to learn how to solve for the perimeter and area of a semicircle. Alternative Nov 14, 2025 · The semiperimeter on a figure is defined as s=1/2p, (1) where p is the perimeter. In this article, you will learn how to identify a semicircle and find the area and perimeter of a semicircle with the help of formulas and solved examples. Find its area and perimeter. Explain the term semicircle? A semicircle is a half circle created by splitting a circle into two equal parts. Then, using Cabri Geometry II, the students will use rotations and translations to transform the triangle into a rectangle. Feb 12, 2025 · 6 Find the perimeter of the given shapes (a) Diagram of a triangle with a semicircle base The triangle sides are 6cm each and the semicircle diameter is 108cm (b) Diagram of a three-quarter circle Calculations of geometric shapes and solids: Semicircle. For the top triangle, you need to calculate the length of the two sides. Calculations of geometric shapes and solids: Semicircle. two semicircles and a square. Learn how the calculate the perimeter of different types of triangles like equilateral, isosceles, scalene, more with solved examples For SAT and ACT Exams. Pythagorean theorem: In a right-angled triangle, the square of the hypotenuse is equal to the sum of the squares of the other two sides (a² + b² = c²). Nov 21, 2023 · What is a semicircle? Learn the area of a semicircle formula and perimeter of a semicircle formula. Oct 26, 2022 · For example, if a composite shape has a semicircle with a radius of 3 inches and a triangle with a base of 6 inches and height of 4 inches, applying the formulas will yield the calculated perimeter and area as described above. See worked examples of how to find area and View the composite 2D figure as a right triangle together with a rectangle less a semicircle, then find any missing lengths in order to calculate the perimeter and area. Leran perimeter and area of geometric figures. This calculator uses feet and or inches for measurements. For instance, if a composite figure consists of a rectangle and a semicircle with a rectangle's width of 4 cm and length of 8 cm, and a semicircle with a diameter of 4 cm, then its perimeter is calculated by adding the perimeter of the Aug 12, 2022 · Find the total perimeter by adding the circumference of the semicircle and the lengths of the two legs. The perimeter combines the straight sides of the triangle with the curved part of the semicircle. The perimeter of a circle is referred to as the 'circumference'. Dec 24, 2024 · A semicircle has its diameter $AC$, and two overlapping triangles $ABC$ and $ADC$ are drawn within it. The perimeter of the shaded figure is approximately 2 × (4. The angle at vertex C is always a right angle of 90°, and therefore the inscribed triangle is always a right angled triangle providing points A, and B are across the diameter of the circle. So, we can write the formulas of area and perimeter for a semicircle using the area and perimeter of a circle. We know that a semicircle is half of the circle, Area of the quarter circle is πr²/2 or πd²/8 (where r is the radius and d is the diameter) However, when calculating the perimeter, we must also consider the radius on the sides of the quadratic circle. Let No description has been added to this video. two semicircles and a rectangle. The semicircle is also referred to as a half-disk. Sep 28, 2022 · To find the perimeter and area of the shape consisting of a triangle and semicircle, calculate the area of both shapes separately and add them together for total area. I know that for a Semicircle Radius = 10 . Thus, two or more plane figures joined with the sides of same measure give rise to combined shapes. From this interesting article, learn more about the semicircle and its formulas to solve some questions to get better at this concept. 4. Give your answer correct to one decimal place. Calculate the area and perimeter (circumference) of a semicircle. Calculate the perimeter of the circle with that diameter and divide it by two in order to get the perimeter of the semicircle. 1 square units. AB, BC and CA are each the diameter of a semicircle. Dec 6, 2022 · The area of the three shaded semicircle is found as 37. The diameter of a circle divides the circle into two equal semicircles. Semi perimeter can be calculated for different plane figures using simple formulas. What do you mean by the perimeter of a Nov 1, 2025 · A triangle and a semi-circle. The semicircle (or Thales ) theorem is presented along with questions and their detailed solutions. Feb 19, 2025 · Perimeter Calculation: The perimeter of a shape is the total distance around its exterior. Find the perimeter and area of the shaded part, rounding your answers to the nearest whole number. We cover everything from the basics of semicircles and triangles to putting it all together in practice In this question, we’ve been asked to calculate the perimeter of a composite figure which looks a little bit like an ice cream cone. The triangle has a base of 7 inches and a height of 6 inches. Use what you learned about perimeters of composite fi gures to complete Exercises 3 –5 on page 328. Points $B$ and $D$ lie on the perimeter of the semicircle, and Area and Perimeter of Harder Compound Shapes Practice Strips (Editable Word | PDF | Answers) Area and Perimeter of 2D Shapes Sort It Out (Editable Word | PDF | Answers) A composite shape is a two-dimensional figure made up of basic two-dimensional shapes such as triangles, rectangles, circles, semi-circles, etc. If you are still wondering how to find a triangle's perimeter or are curious about the formulas for a perimeter of a triangle behind this calculator, keep reading. Learn how to find the area of a composite figure with a rectangle and a semicircle. See full list on gigacalculator. The formula is: $$ P = 2r + \pi r $$ And Without this information, we cannot calculate the perimeter or the area. It is a circular arc that measures 180°, or π radians, or a half-turn. Perimeter and Area of a Rectangle A rectangle is a figure/shape with opposite sides equal and all angles equal to 90 degrees. 24 12 in 2. You know the length of the Jun 13, 2025 · Equation of semicircle (Upper and Lower) – Formula, Examples <b></b> What is the Equation of Semicircle? The equation of a semicircle can be deduced from the equation of a circle. Check out our other handy tools: triangle area calculator, right triangle calculator, and equilateral triangle calculator – these are a safe bet for your geometry problems. This video explains how to determine area by decomposing the area into a semi circle and triangle. We can draw a triangle ABC where AB is a diameter of a circle, and C lies on the circumference of the circle: The angle at the circumference C will A composite shape is a figure formed by combining two or more basic geometric shapes, like circles, squares, triangles, or stars. Perimeter of a triangle calculation using all different rules: SSS, ASA, SAS, SSA, etc. Unformatted Attachment Preview GEOMETRY: The diagram shows a shaded shape ABCD made from a semicircle ABC and a right-angled triangle ACD. The 8 The diagram below consists of a square with a side of 4 cm, a semicircle on the top, and an equilateral triangle on the bottom. Jan 11, 2023 · Learn the semicircle definition, how to find the perimeter of a semicircle, and find the area of a semicircle using the semicircle area formula. The most common ones are Square, Triangle, Rectangle, Circle etc. These calculations were made by analyzing each shape individually within the composite figure. You know the diameter. Learn key formulas, examples and methods to calculate perimeter and area for different shapes. Semicircle Formulas Half a portion of any circle is known as a semicircle and is formed by cutting a whole circle along the diameter. Assess your skill with semicircles in this seventh-grade worksheet! In each of these eight problems, students will need to apply their knowledge of circle circumference. I assume the bottom shape is meant to be a semicircle. more Apr 20, 2023 · The estimated perimeter of the shaded figure is about 23. For the stated question; The perimeter of equilateral triangle = 24. Use π =3. In geometry, a semicircle is a plane figure that is formed by dividing a circle into exactly two parts. Area of a Semicircle Calculator The calculator will calculate the radius, arc length, area of the sector, perimeter, and diameter of a semicircle. Work out the perimeter of the shaded shape. In this article, you will learn the definition of semi perimeter and the formula of semi perimeter for different shapes, along with examples. The perimeter of a semicircle is defined as the total length of the boundary of the semicircle. National 4 Perimeter and area Perimeter and the area of a semicircle In this National 4 Lifeskills Maths study guide, you can revise how to find the perimeter and area of triangles, quadrilaterals Circle inscribed in Triangle Calculator This CalcTown calculator calculates the inscribed circle radius, its area and perimeter. Oct 1, 2018 · area, circle, circle formula, circumference, diameter radius, shape, shapes associated of circles, Singapore Primary School mathematics, teaching methods, PSLE Dec 17, 2018 · Suppose we have a triangle with a right angle at its height, with side a, 10 inches, side b, unknown, and side c, 24 inches; inscribed in a semi-circle. Unlike perimeter, in a circle there are no straight segments to measure, so a special formula is needed. Finding the Perimeter of a Combined Semicircle and Square! markiedoesmath 148K subscribers Subscribed A semicircle is a 2D shape formed by cutting a circle into two equal parts. Another example is an ice cream cone. Suppose the height and base of a triangle are twice the length of the height and base of another triangle. In this National 4 Lifeskills Maths study guide, you can revise how to find the perimeter and area of triangles, quadrilaterals (rectangle, parallelogram, rhombus, kite and square), Learn about Semicircle in this article, its definition, formula, steps to find area, circumference, angle inscribed, centroid, properties using examples here Inradius, semi-perimeter, and area The inradius of a triangle is formed by first dividing each of the three angles in half by a line (refer to dotted lines in the below image). Find the perimeter of the figure to the nearest tenth of a centimeter. 5 units. ABC is drawn circumscribing this circle whose sides BC,CA and AB touch the circle at point D,E and F respectively. From this find out Area of the Semicircle. The three splitters concur at the Nagel point of the triangle. In this lesson, the students will algebraically prove that the area of a triangle is equal to its semi-perimeter times the radius of its in-circle (A=sr). Using appropriate values for radius, base, and height will yield specific measurements. Calculate the Perimeters of Individual Shapes: Determine the perimeter of each individual shape using the appropriate formulas. two-dimensional shapes. A triangle and a semi-circle. The area of the triangle is denoted by ∆ or S. We have a semicircle which sits on top of a triangle. The most notable cases are in the altitude, exradius, and inradius of a triangle, the Soddy circles, Heron's formula for the area of a triangle in terms of the legs a, b, and c A_Delta=sqrt(s(s-a)(s-b)(s-c)), (2) and Learn how to find the area of a composite figure with a rectangle and a semicircle. Try your hands at our Online Perimeter of a Semicircle Calculator- an effective tool to solve your complicated calculations. Area of a Semicircle calculator. The triangle has a base of 5 inches and a height of 4 inches. Perimeter of Semicircle The perimeter of a semicircle is the sum of the half of the circumference of the circle and diameter. Simply enter the required parameters (such as radius or diameter), and it will provide step-by-step calculations for each of the geometric properties. In this example Mar 17, 2023 · To determine the total length of sparkling lights Bobby can add to the banner, we need to calculate the perimeter of the entire figure, which consists of an isosceles triangle, a rectangle, and a semicircle. Circumference of a Circle/Semicircle: The circumference of a circle is given by C = 2πr, where 'r' is the radius. Various parameters related to a semi-circle like a diameter, area, the perimeter can be calculated using semicircle formulas. 2 + 2) + 9. Watch how to calculate the combined area of a semi-circle which is attached to the end of a rectangle. You can break it down into a rectangle and a semicircle, as shown below. For a triangle having sides of length a, b, and c and area K, we have K = sqrt [ s (s - a) (s - b) (s - c) ], where s = ½ (a + b + c) is the triangle's semi-perimeter. In this example A semicircle is a half-circle that is formed by cutting a whole circle into two halves along a diameter line. Here, the perimeter of the three solid sides of the rectangle is 8 + 20 + 20 = 48 feet. For composite shapes (shapes made up of multiple simpler shapes), calculate the perimeter of each component and sum them. It is a two-dimensional shape that is formed when a circle is cut into two equal parts. In terms of diameter, the formula is expressed as, Perimeter = π (d/2) + d, where 'd' is the diameter of the semicircle. Learn how to calculate the perimeter of combined shapes quickly and accurately. Find the perimeter of the fi gure. By signing up, you'll get thousands of A semicircle is drawn to fit tightly inside a right-angled triangle with sides of length 3, 4 and 5 centimetres, as shown in the diagram. Jan 25, 2021 · For example, if you were to find the perimeter of a semicircle with the same radius and a different triangle height, you would follow the same method: calculate each component's contribution to the overall perimeter and area. Answer to: A semi-circle sits on top of a rectangle to form the figure below. Apr 8, 2019 · The perimeter of the shaded region, which includes a semicircle and two straight sides of a rectangle, can be calculated by adding the arc length of the semicircle and the lengths of the two straight sides. Find the perimeter of 12 popular shapes with this intuitive perimeter calculator - quick, accurate, and user-friendly! The figure below is made up of a semi-circle and a quadrant. In this step-by-step guide, you will learn how to find the area and perimeter of the semicircle. The semicircle has only one line of symmetry which is the reflection symmetry. As the perimeter of a circle is 2πr or πd. The key to finding the area of a composite figure is to figure out what type of shapes you have. Formulas, explanations, and graphs for each calculation. Learn about semicircles in detail here, including its shape, properties, formulas for Circumference and Area, and solved examples. Dec 3, 2015 · A triangle and a semi-circle. Aug 29, 2023 · By entering the semicircle’s radius, or the dimensions of the triangle, you can obtain precise, real-world applicable results almost instantaneously. The house shape is made up of two simple shapes: a square and a triangle. The radius of the circum-circle of the triangle is called the circum-radius and is denoted by R. The missing dimension for the triangle part is 20 - 12 = 8cm. 5\times 4\times 3 = 6\) square units. For the perimeter, we would add up the lengths of all the sides of the triangle and the circumference of the semi-circle. The area of the triangle is 21 ×6 × 6 or 18 square units. This lesson is for more advanced geometry students. So, the perimeter is about: ___________ a semicircle and a triangle. A composite shape is a figure formed by combining two or more basic geometric shapes, like circles, squares, triangles, or stars. Perimeter = (πr + 2r), where "r" is the radius of the semicircle and π is a constant with a value of 22/7. Apr 2, 2021 · To find the perimeter of a figure made up of a semicircle and a triangle, we will calculate each part step-by-step: Identify the Dimensions: Assume the semicircle has a radius 'r' and the triangle is a right triangle with a base 'b' and height 'h'. Work out the perimeter of the shape. Like perimeter, the circumference is the distance around the outside of the figure. Notice that the dividing line between these two shapes — that’s the third side of the triangle or the straight edge of the semicircle — is not part of the perimeter because it isn’t part of the outside of the full figure. It is created when a line pierces the circle's center and touches its two ends. 2 Lesson Lesson Tutorials Key Aug 3, 2023 · What is a semicircle & what does it mean – learn how to find the radius, diameter, area, perimeter (circumference), arc length, & inscribed angle with formula By Thales' theorem, any triangle inscribed in a semicircle with a vertex at each of the endpoints of the semicircle and the third vertex elsewhere on the semicircle is a right triangle, with a right angle at the third vertex. Click here for the full guide with examples and solutions. The perimeter of a semicircle can be worked out by applying the formula P = (Pi*d/2) + d. The area of any semicircle is half of the area of a circle. The semiperimeter of polygons appears in unexpected ways in the computation of their areas. Perimeter of The triangle ABC inscribes within a semicircle. This article looks at the theorem itself and how it relates to other circle theorems. Use 3. e. To know the area and perimeter of all these, we need different formulas. Use Cuemath's Online Perimeter of a Semicircle Calculator and find the perimeter of a semicircle. See worked examples of how to find area and Apr 16, 2021 · The total perimeter of the figure, consisting of a semicircle and a triangle, is approximately 69. So, the perimeter of a semicircle is 1/2 (πd) + d or πr + 2r, where r is the radius. Since the semicircle is half of the circle (360 degrees), the arc of the semicircle always measures 180 degrees. By adding the length of these sides, we obtain the perimeter of the shape. Formula for area and perimeter of a semicircle. Dec 29, 2023 · The Semi Circle Perimeter Calculator is a valuable tool used to determine the perimeter or circumference of a semicircle. a semicircle and a triangle. Areas of Simple Shapes Composite Figures Composite Figure: A figure that can be divided into more than one basic figure such as a triangle, rectangle or semicircle. Find the area and perimeter of the following figure. The perimeter of a circle is called the circumference: Unit 9 Section 3 : Perimeter of Special Shapes In this section we calculate the perimeters of various shapes. To find the perimeter of a composite figure, add the lengths of the sides. The shape below contains a triangle and a semi-circle. Each Joe has to mow the lawn of the field below, how many square meters must he mow? 14 m Area of Semi-Circle + Area of Rectangle + Area of Triangle bxh bxh+2 3. A cleaver of a triangle is a line segment that bisects the perimeter of the triangle and has one endpoint at the midpoint of one of the three sides. com Estimate the perimeter of the figure. Area and Perimeter For all Shapes There are many types of shapes. The first step is to identify simpler figures within this composite figure. So any cleaver, like any splitter, divides the triangle into two paths each of whose length equals the semiperimeter. Visit https://maisonetmath. . The semi perimeter of a triangle is expressed in linear units like inches, yards, centimeters, and so on. Jun 26, 2025 · This SAT® Math guide simplifies area and perimeter with easy-to-follow formulas, visual examples, and tips for handling scaled figures. May 23, 2022 · A semicircle is a semicircle. If you want to view all of my vide What do we observe from the above figures? The shape of a glass window is like a semi-circle placed over a rectangle whereas the front – facing wall of a model house looks like a triangle over a square. Estimate the perimeter of the figure. The calculations involved the properties of a 45-45-90 triangle, a square, and a semicircle. For example, a figure might consist of a rectangle, a triangle, and a semicircle. Jul 23, 2025 · Semicircle is a half circle formed by cutting the circle into two halves. Drawing a line from the top of the triangle to the base will generate two right triangles. Semicircle = a circle cut in half along its diameter Watch how to calculate the combined area of a semi-circle which is attached to the end of a rectangle. You know how to find the perimeter of a rectangle, and you know how to find the circumference of a circle. Likewise, list the shapes used to make an invitation card and a locker. This is because a semicicle has two sides; a curved edge and the diameter. Feb 6, 2025 · Circumference of a semicircle: The circumference of a semicircle is given by the formula πr + 2r, where 'r' is the radius. Find the area of the triangle: \ (0. A semicircle is formed […] The centre of a circle is O. Apr 6, 2025 · The angle in a semicircle theorem is a circle theorem. Example 1 What is the area of this shape? Split the compound shape into two simple shapes: a rectangle and a triangle: The area of the rectangle part is 12 x 10 = 120 cm 2. The semi perimeter of a triangle is half the perimeter of a triangle. This semicircle area calculator determines the area of a half circle, as well as the circumference of a semicircle. Semicircle = a circle cut in half along its diameter Apr 23, 2024 · How to Find Perimeter in 3 Easy Steps Math Skills: Learn how to find the perimeter of a rectangle, square, triangle, parallelogram, and circle. IN YOUR OWN WORDS How can you fi nd the perimeter of a composite fi gure? Use a semicircle, a triangle, and a parallelogram to draw a composite fi gure. Semiperimeter and Half Angle Formulae Property - 3: Semi-perimeter and half-angle formulae For a \ (\Delta ABC\) , with sides a, b, c, its semi perimeter is the quantity \ [\boxed {\;s = \frac { {a + b + c}} {2}\;}\] One of the most important sets of properties followed by triangles is the set of half-angle formulae tabulated below. Area of compound shape = area of rectangle + area of triangle = 120 + 40 = 160 cm 2. Learn to determine the perimeter of a semicircle with examples. The perimeter of a semicircle is found by adding the length of its diameter (d) to the length of its arc, which is half the circumference of the full circle, equal to πr. The perimeter of the triangle is denoted by 2s and semi-perimeter of the triangles denoted by (a + b + c)/2 . On our previous video, we already discussed what is circle and how to solve for the circumference Definition of semicircle. Find the area and perimeter 4. com for more practice. Aug 5, 2025 · The perimeter of a composite figure is the total length of all its outer sides. the opposite and the adjacent of the right triangle is given so we solve for the hypotenuse. The diagram shows a shape made up of three semicircles, enclosing a right-angled triangle. Find the area and perimeter 30 in 30 in 20 in 70 in 1. This video demonstrates how to find the area and perimeter of irregular shapes that have a semicircle as one of the shapes. A semicircle is simply half of a circle. 3 + 3 + 3 + 3 + 3 = 5×3 = 15. 14 for 7T 2. They will then show that the area of the resulting rectangle is Sep 7, 2022 · The hydraulic radius calculator finds the wetted perimeter and hydraulic radius for circular pipes and three different channel shapes. Semicircle Thales Theorem Statement The semicircle (Thales) theorem [1] states that for a triangle inscribed in a semicircle of diameter A B, as shown in the figure below, angle A O B has a size of 90 ∘. 9 units, and the estimated area is about 27. The formula for calculating the area of a semicircle is: $$ A = \frac {\pi \cdot r^2} {2} $$ where r is the radius of the semicircle. B A 17cm D AC is the diameter of the semicircle ABC. Label the dimensions. Area, Circumference, Perimeter, Diameter of a Semicircle, step-by-step online A semicircle is a half-circle that is formed by cutting a whole circle into two halves along a diameter line. Apr 3, 2023 · The longest side of a right - angled triangle is its hypotenuse, it should be emphasized. Learners can use this formula to Area of a Semicircle Calculator The calculator will calculate the radius, arc length, area of sector, perimeter, and diameter of a semicircle, with step-by-step calculations displayed. The Additive Areas Method for finding the area of a composite shape involves finding the individual areas of each piece of the composite shape and summing them up. 8. Perimeter is the distance around a two-dimensional shape. Therefore, Area is the size of a surface Learn more about Area, or try the Area Calculator. Find the area and perimeter 6 cm 2 cm 5 cm 9 cm 5 cm 8. http://mathispower4u. 68 square inches. Give your answer correct to 3 significant figures. The area of the rectangle is the space covered by it in an XY plane. The shape consists of a semi-circle with a radius of 10. The diameter of the inscribed semicircle will be equal to the length of the base of the triangle, and the vertices of the triangle will be tangent to the semicircle. The radius of the in-circle of the triangle is called the in-radius and is denoted by r. Since our measurement of the semicircle’s circumference is approximate, the perimeter will be an approximation also. Find the perimeter. This composite figure is made up of a triangle and a semicircle. com An easy to use, free perimeter calculator you can use to calculate the perimeter of shapes like square, rectangle, triangle, circle, parallelogram, trapezoid, ellipse, octagon, and sector of a circle. Estimate the diagonal lengths to be 1. 68 feet when calculated correctly and rounded to the nearest hundredth. There are two types of semicircle equations – Upper semicircle and lower semicircle equation. 8 The diagram below consists of a square with a side of 4 cm, a semicircle on the top, and an equilateral triangle on the bottom. Jul 23, 2025 · In this article, we will explore all the different formulas to find the Area and Perimeter of various geometric shapes such as Triangles, Squares, Rectangles, Rhombus, Parallelogram, Circle, Semicircle, and Ellipse. 8 units. The calculator employs mathematical formulas to derive the dimensions of the triangle inscribed in the semicircle. The area within the triangle varies with respect to its perpendicular height from the base AB. Learn: Perimeter What is Semi Perimeter? Nov 28, 2020 · A triangle and a semi-circle. Calculate the perimeter: The perimeter of the shape is the sum of the lengths of the three semicircles. On our Area of a Semi Circle page you will find support, worked examples and worksheets to help you learn and master this skill. Now, I'm asked to find the area of the semi Jul 15, 2023 · As an example, let’s say we have a compound figure made up of a triangle with a base of \ (4\) units and height of \ (3\) units, and a semicircle with a radius of \ (2\) units: Decompose the figure into a triangle and a semicircle. On our Perimeter of a Semi-Circle page you will find support and worksheets to help you learn and master this skill. Find the area and perimeter. What is the ratio of the area of the smaller to the area of the larger triangle? The right triangle and the semi circle Therefore, the perimeter of the shape includes perimeter of semicircle and the perimeter triangle To complete the perimeter of the triangle we add two sides of the triangle. Find the length marked in red. The diameter of a circle is the name given to this line. To estimate the area of the shaded figure, we need to find the areas of the triangle, square, and semicircle. Question: 3. In this geometry lesson, we go over how to find the Perimeter of a Semicircle. The diameter of the circle matches the base of the triangle. 'Semi' means half, that is why the semi perimeter of a triangle is half the value of the perimeter. Question With Solutions Apr 8, 2019 · The perimeter of the shaded region, which includes a semicircle and two straight sides of a rectangle, can be calculated by adding the arc length of the semicircle and the lengths of the two straight sides. In this video, we explain the formulas of Area and Perimeter for the geometrical figures: Square, Rectangle, Triangle, Circle and Semi-circle. It is the measurement related to plane figures, i. It includes a proof of the theorem, and there are several exam-style questions and answers at the end. The point at which these three lines meet is the center of the incircle, and the inradius is a line drawn from the center to perpendicularly intersect a side of the triangle. The introduction provides a formula for students to use and an explanation that the perimeter of a semicircle is equal to half the circumference of the circle plus the length of the diameter. Prove that AF = semi-perimeter of ABC−BC. 5 mm, a rectangle with a height of 10 mm and a width of 13 mm, and a right-angled triangle attached to the rectangle. dicepb hkwhul jnhoy xaxlnx fokf qczmwdp giau jvnonk vbapo pmdov xmoaf vojuid tizhuvkk ebtzo lupv