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The volume of a cylinder is:

V1 = pi r2 h

V2 = pi (2r)2 2h = pi 4r2 2h = 8pi r2 h

V1/V2 = (pi r2 h)/(8 pi r2 h)

V1/V2 = 1/8

Thus, V2 is 8 times bigger than V1.

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