Homework Help: geometry

Posted by Anonymous on Wednesday, July 6, 2011 at 6:16pm.

"Triangle DEF is similar to triangle ABC, and the length of side DE is 6 cm. The length of side AB is 2 cm. If the area of triangle ABC is 5 square cm, what is the area of triangle DEF?

geometry - Reiny, Wednesday, July 6, 2011 at 8:48pm
the ratio of areas of two similar shapes is proportional to the square of their corresponding sides

so area DEF/5 = 6^2 / 2^2 = 36/4 = 9/1
area DEF = 45

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