Q. 55.0( 1 Vote )

# The volume of a cone is 308 cm3. Its height is 6 cm. The radius of its base is—A. 7 cmB. 8 cmC. 6 cmD. None of these

Answer :

Let r be the base radius of cone

Volume of cone = 308 cm3

Height = h = 6 cm

Volume of cone = πr2h

308 = × × r2 × 6

= r2 × 2

14 × 7 = r2 × 2

r2 = 7 × 7

r = 7 cm

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