### Home > AC > Chapter 3 > Lesson 3.1.6 > Problem 3-58

3-58.

Write an expression that represents the perimeter of the shape built with algebra tiles below. Then find the perimeter if units and

*units.*

Find the length of each side, and then sum the lengths.

Once you find an expression for the perimeter, substitute 3 for and 7 for

*.*

28 units