Volume of cylinder:
Formula: pi * r^2 * h
r = 2, h = 20
pi * 2^2 * 20
pi * 4 * 20 = 20pi
Solution: A
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The r would be the number 1 because you would have to make the 2 and 10 equal and 5 x 2 equals 10. 1+1=2.