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# A right circular just encloses a …

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A right circular just encloses a sphere .find I) surface area of the sphere II) curved surface area of the cylinder III) ratio of the areas obtained in (I) and (II)

Preeti Dabral 1 month, 2 weeks ago

1. Surface area of the sphere ={tex}4\pi r^2{/tex}
2. For cylinder
Radius of the base = r
Height = 2r
{tex}\therefore{/tex} Curved surface area of the cylinder = {tex}2\pi rh=2\pi (r)(2r)=4\pi r^2{/tex}
3. Ratio of the areas obtained in (i) and (ii)
{tex}={{surface\ area\ of\ the\ sphere}\over{curved\ surface\ area\ of\ the\ cylinder}}{/tex}
{tex}={{4\pi r^2}\over{4\pi r^2}}={1\over1}=1:1{/tex}

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