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Question

The height of a cone is 21 cm and its slant height is 28 cm. The volume of the cone is
(a) 7356 cm3
(b) 7546 cm3
(c) 7506 cm3
(d) 7564 cm3

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Solution

(b) 7546 cm3

Radius of the cone, r=l2-h2 =282-212 =784-441 =343 cm

Volume of the cone =13πr2h =13×227×343×21 =22×343 = 7546 cm3

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