Question

A sphere of radius r is exactly contained in a cylinder. find the ratio of surface area of the sphere to cylinder. #no spam plzz​

Answer 1

Surface area of sphere = 4πr²

Height of cylinder = r+r=2r

Radius of cylinder = r

CSA of cylinder = 2πrh = 2πr(2r) = 4πr²

Required Ratio=

$\frac{ 4πr² }{4πr²} = \frac{1}{1}$

Answer-: 1:1

Answer 2

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