Homework Help: math

Posted by tatyana on Wednesday, March 13, 2013 at 9:17am.

The dimensions of circle B are three times the dimensions of circle A. The area of circle A is 49 cm2.

What is the area of circle B?

math - Reiny, Wednesday, March 13, 2013 at 11:11am
areas of circles are proportional to the square of their radii
so
49/area of B = r^2/(3r)^2 = 1/9
area of B = 9(45) or 405 cm^2

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