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How to Find the Perimeter of a Regular Pentagon

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  • 0:00 Recognizing a Regular Pentagon
  • 0:41 Finding the Perimeter
  • 1:19 Using Addition and…
  • 2:13 Lesson Summary
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Lesson Transcript
Instructor: Jaimee Arnold

Jaimee has worked in elementary school and has her Master's +30.

In this lesson, you'll learn how to find the perimeter of a regular pentagon in two different ways. You'll also discover how to tell the difference between a regular and an irregular pentagon.

Recognizing a Regular Pentagon

A pentagon is a shape that has five straight sides. In this lesson, you'll learn about regular pentagons, which means that all the sides are the same length, and all the angles are the same size. An irregular pentagon has five sides, but the sides can be any length, and the angles can be different sizes. Look at the diagram:

Regular and Irregular Pentagons

You'll find a few examples of what both regular and irregular pentagons look like. Usually, people think of pentagons as being in the shape of a house, but remember that the shape can be turned sideways or even upside down!

Finding The Perimeter

Perimeter is the distance around a shape; think of it as a border or a fence. To find the perimeter of any shape, you simply add all the sides together. If you're finding the perimeter of a pentagon, there are five sides so you'll add the lengths of those sides together. The sum will be your answer.

In this lesson, you'll practice with regular pentagons, so you can take the measurement of one side of a regular pentagon and multiply it by five to get your answer. In the picture, you can see how to use either addition or multiplication to determine the perimeter of a regular pentagon.

Perimeter of a Regular Pentagon

Using Addition and Multiplication

You can use either addition or multiplication to find the perimeter of the next problem. If you want to double check your work, you can use both ways! On screen is an example of a regular pentagon, which means all of its sides are the same length. In this example, each side has a length of nine inches.

Perimeter of a Pentagon Example

There are two ways to figure out the perimeter.

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