Q5 of 67 Page 195

The volume of a cone is 308 cm3. Its height is 6 cm. The radius of its base is—

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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