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A cylinder of radius $r$ is surmounted on a hemisphere of same radius. If total height of the object is $13 \text{ cm}$, then its inner surface area is
- (a)$2\pi r(r + 13)$
- (b)$13\pi r$
- (c)$2\pi(13 + r)^2$
- (d)$26\pi r$
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Answer (D) $26 \pi r$