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Math for Kids23 chapters | 325 lessons

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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.

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:

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!

**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.

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.

There are two ways to figure out the perimeter.

- Option One: You can add all the sides together. In this case, 9 + 9 + 9 + 9 + 9 = ?
- Option Two: You can multiply one side of the pentagon by five, because all the sides are of equal length; in this example, 9 x 5.

Using either option, your answer will be the same:

- 9 + 9 + 9 + 9 + 9 = 45 inches.
- 9 x 5 = 45 inches.

A **pentagon** is a polygon with five sides. The **perimeter** is the distance around the outside of the shape. To figure out the perimeter of a regular pentagon, you can add all the sides together or take the measurement of one side and multiply it by five. Remember, the multiplication option only works when the shape is regular, which means all of the sides are the same length.

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Math for Kids23 chapters | 325 lessons

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