A right circular cylinder just encloses a sphere of radius r.Find the height of the cylinder
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Step-by-step explanation:
(i) SA of sphere =4πr2
(ii) Height =r+r=2r
radius =r
⇒Curved Surface Area=2πrh=2πr(2r)=4πr2
(iii) Ratio =4πr24πr2=11 or 1:1
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