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OpenStudy (anonymous):
The difference of the areas of two circles is 21π. If their radii are r+3 and r, find the radius of the larger circle.
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OpenStudy (anonymous):
5
OpenStudy (anonymous):
how u get?
OpenStudy (anonymous):
pi(r+3)^2 - pi(r)^2 = 21 pi
myininaya (myininaya):
r^2+6r+9-r^2=21 6r=21-9 6r=12 r=2 r+3=2+3=5 gj fax!
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