### Home > MC2 > Chapter 9 > Lesson 9.3.1 > Problem 9-74

9-74.

Try finding the scale factor between the two corresponding sides that are given and solve for *x*.

Another way to solve for *x* is to create a proportion.

One possible proportion is shown below.

x = 6 cm

Use the formula for area of a triangle:

What is the scale factor between the larger triangle and the smaller triangle? Find the ratio between corresponding sides.

Scale factor matches proportion.