### Home > MC2 > Chapter 6 > Lesson 6.2.4 > Problem 6-109

6-109.

Which corresponding sides in A and in B are both known?

What do you need to multiply 8 by to get 20?

Identify which sides in A correspond to which sides in B.

Since 16 corresponds to *t* and *s* corresponds to 35, multiply 16 by the scale factor to find *t*, and divide 35 by the scale factor to find *s*.

The scale factor is what you multiply by to increase or decrease the size of a shape.

If a scale factor greater than one created a larger triangle, then a scale factor less than one must create a smaller triangle.

Note that a scale factor cannot be negative because a negative side length is nonexistent.