### Home > MC2 > Chapter 9 > Lesson 9.3.3 > Problem9-113

9-113.

What is the scale factor between the two triangles?

$\frac{120}{15} = \frac{160}{x}$

x = 20 cm

See (a).

If the ratio of the perimeters is the scale factor, the ratio of the areas is the scale factor squared.

$\frac{1}{64}$