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A cone of height '$h$' and radius '$r$' is surmounted on a solid cylinder of same dimensions. The total surface area of the entire solid will be :
- (a)$2\pi rh + \pi r \sqrt{h^2 + r^2}$
- (b)$2\pi rh + \pi r^2 + \pi r \sqrt{h^2 + r^2}$
- (c)$2\pi rh + 2\pi r^2 + \pi r \sqrt{h^2 + r^2}$
- (d)$2\pi rh + \pi r \sqrt{h^2 + r^2} - \pi r^2$
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Ans: (B) $2\pi rh + \pi r^2 + \pi r \sqrt{h^2 + r^2}$