### Home > CC3 > Chapter 8 > Lesson 8.1.1 > Problem 8-12

8-12.

Similar shapes have sides with equal ratios to each other. To find each unknown side, compare its ratio to a known side.

For example, the ratio of the 15 mm side to the 22 mm side should be equal to the ratio of the z side to the

33 mm side.

*z* = 22.5 mm

You can now use the value of *z* to find ratios for the other unknown sides. Write two more ratios to solve for side *x* and side *y*.

15*y* = (22.5) (54)

*y* = 81 mm

What does *x* equal?