Question
A right circular cone has a radius of 9 cm and a height
of 12 cm. Find the curved surface area of this cone.Solution
Slant height of the cone = β{(radius)2Β + (height)2} = β(92Β + 122) = β(81 + 144) = β225 = 15 cm So, curved surface area of the cone = Ο X radius X slant height = 135Ο cm2
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