SOLUTION: If the diameter of circle A is twice that of circle B, what is the ratio of the area of circle A to the area of circle B?

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Question 697564: If the diameter of circle A is twice that of circle B, what is the ratio of the area of circle A to the area of circle B?
Answer by Alan3354(69443) About Me  (Show Source):
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If the diameter of circle A is twice that of circle B, what is the ratio of the area of circle A to the area of circle B?
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It's 4 times.
Area+=+pi%2Ar%5E2+=+pi%2Ad%5E2%2F4
The diameter is squared, so 2d --> 4d^2