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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.

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

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

New sides: ,, and 

What would the scale factor be?