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Its just the area of a circle

21 inches or 21 centimeters?

area of a circle is (pi)*r2 where pi = 3.1415.... and r = radius

thus A = (3.1415)*(diameter/2)2

u can figure out the answer from that with a calculator

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16y ago

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Q: What is the base area of a cylinder with the diameter of 21?
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