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# A right circular cylinder just encloses a sphere of radius r. Find (i) surface area of the sphere

Q : 9    A right circular cylinder just encloses a sphere of radius $\small r$ (see Fig. $\small 13.22$). Find

(i) surface area of the sphere,

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Given,

The radius of the sphere = $r$

$\therefore$ Surface area of the sphere = $4\pi r^2$

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