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  • Perimeter formulas

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    Here, find the perimeter formulas for some regular polygons. A regular polygon is a polygon with equal sides and equal angles. If we let s be the length of one sides, we can find the perimeter as demonstrated in this lesson Equilateral triangle: Perimeter = s + s + s Perimeter = 3 × s…

  • Find the perimeter in the coordinate plane

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    In order to find the perimeter in the coordinate plane, you can use the ruler postulate and the distance formula. Example #1 Find the perimeter of triangle ABC in the figure below Find the length of each side of the triangle. Then, add the lengths to find the perimeter. Using the ruler postulate, AB =…

  • Circumference of a circle – Definition, formula, and examples

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    The circumference of a circle, also called the perimeter of a circle, is the distance around a circle or any circular object such as a clock, a pizza, or a dinner plate. For example, the distance around a circular clock is the circumference of the clock.  How to find the circumference of a circle? Method…

  • Perimeter of a trapezoid

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    The perimeter of a trapezoid where a, b, c, d are the lengths of its sides can be found using the formula p = a + b + c + d. Just like any other two-dimensional figures, the perimeter is just the sum of the lengths of the sides. Example #1: Find the perimeter for the trapezoid…

  • Perimeter of a triangle

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    The perimeter of a triangle is the distance around the triangle. In other words, the perimeter is the sum of the lengths of the sides of the triangle. You will learn different ways to find the perimeter based on the different types of triangles.  Perimeter of a triangle formula Start with a scalene triangle and…

  • Perimeter of a rectangle

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    Finding the perimeter of a rectangle when the length and the width are given and finding the length or the width when the perimeter is given are the goals of this lesson. Start with the rectangle below and label the width w and the length l. Given a rectangle with side length (l) and width…

  • Perimeter of a square

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    The perimeter of a square is the distance around the square. In other words, the perimeter is the sum of the lengths of its sides. Since the sides of a square are all equal, you can just multiply the length of one side by 4 to get the perimeter. Derivation of perimeter of square formula…

  • Finding the perimeter

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    Finding the perimeter of a shape means that you are looking for the distance around the outside of that shape. Example #1 Find the distance around for the following irregular polygon Distance around = 5 inches + 4 inches + 2 inches + 3 inches + 6 inches = 20 inches Example #2 Find the distance around…

  • Sum of all exterior angles of a polygon

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    To help you see what the sum of all exterior angles of a polygon is, we will use a square and then a regular pentagon. Since it is very easy to see what the sum is for a square, we will start with the square. You can also use rectangles!    Notice that an exterior…

  • Properties of a parallelogram

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    The properties of a parallelogram are listed below. We will use a parallelogram ABCD to show these properties. Property #1 Opposite sides of a parallelogram are congruent. The length of AB is equal to the length of DC.The length of BC is equal to the length of AD. Here is how to prove that opposite…