SOLUTION: How many circles with radius of 4 inches, will have the same total area as a circle with radius 12 inches?

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Question 532776: How many circles with radius of 4 inches, will have the same total area as a circle with radius 12 inches?
Answer by htmentor(1343) About Me  (Show Source):
You can put this solution on YOUR website!
Area of a circle = pi%2Ar%5E2%29
If r=4, the area is 16%2Api
If r=12, the area is 144%2Api
So the number of 4 in. circles = 144/16 = 9