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Question

The slant height (l) of a cone of radius r and height h is

A
r2+h
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B
r2+h2
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C
r2+h2
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D
(r2+h2)2
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Solution

The correct option is C r2+h2

By observing the figure and by applying Pythagoras' theorem in the right-angles triangle whose base is r, height is h and hypotenuse is l(slant height of cone), we get
l2=r2+h2
l=r2+h2

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