### Home > MC2 > Chapter 3 > Lesson 3.2.2 > Problem 3-71

3-71.

The perimeter is the sum of all the side lengths that do not touch another tile.

Label and add all the side lengths together:*x* + *x* + ( *x* − 1) + *x* + 1 + *x* + *x*

Simplify this expression.

The area of each tile is shown in the center of it.

Add the two areas together: *x*^{2} + *x*

Replace *x* with 7 in both equations.

Area = 7^{2} + 7

Perimeter = 6(7)

Area = 56 sq. un.

Perimeter = 42 un.

See part (a).

See part (a).