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a(r) = 2pi*r^2 and d = 2r

5 = 2r => r = 5/2

a(r) = 2pi*(5/2)^2

a(r) = 2pi*25/4

a(r) = 25pi/2 or, in decimal form, 39.2699 millimetres2

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12y ago
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Q: What is the area of a circle that has a diameter of 5 millimeters?
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