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