CPM Homework Help : MC2 Problem 5-48

Figures A and B at right are similar. Assuming that figure A is the original figure, find the scale factor and find the lengths of the missing sides of figure B.

A 4 sided polygon, labeled A, with sides labeled as follows: left, 15, top, 12, right, 18, bottom, 20.

A smaller, 4 sided polygon, labeled b, oriented the same way, has left side labeled: 3.

Hint:

Use the ratio between the known sides to find unknown sides.

More Help:

What is the ratio between the two corresponding side lengths: $15$ and $3$ ?

Answer:

New sides: $4$ , $\frac{18}{5}$ , and $\frac{12}{5}$

What would the scale factor be?