Question

Because of the vertical angles and alternate interior angles we know these are similar triangles. Use what you know about proportional sides to solve for the unknown side ,x

Answer 1

x = 20

Explanation:

Length 6 corresponds to length 15

Length 8 corresponds to length x

15 ÷ 6 = 2.5

8 • 2.5 = 20

x = 20

2.5 is the scale factor of the small triangle to the big triangle.