Q3 of 189 Page 500

The volume of a right circular cone is and its height is 12 cm. Find its slant height and its curved surface area.

Given,


h = 12 cm


Volume of the cone = 100π cm3



r2h = 100 × 3


r2 × 12 = 100 × 3


r2 = = 25


r = 5cm






Curved surface area = πrl


= π × 5 × 13


= (65π) cm2


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