### Home > MC2 > Chapter 3 > Lesson 3.1.2 > Problem 3-20

3-20.

The perimeter is the sum of all the sides.

What is the value of each side?

Now, add up all the sides to find the perimeter.

*x* + 1 + *x* + 1 + 1 + 1 + *x* + *x*

Each side piece has been labeled.

Simplify, and you get 4*x* + 4.

Refer to part (a).

Each side piece has been labeled.