Answers

2015-03-10T23:51:41+05:30
Volume of cylinder=πh(R²-r²)
                          =5120π
5120π=20πr²
5120=20r²
√256=r
⇒r=16
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2015-03-11T10:14:33+05:30

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Volume of hollow cylinder = πh(r1²-r2²)
= π * 40 * (12²-4²)
= π * 40 *128
=5120π cm³

Volume of solid cylinder = π r² h = volume of hollow cylinder
π r² 20 = 5120 π
r² = 5120/20
r² = 256
r = √256
r = 16 cm
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