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Question
The curved surface area of a right circular cone of height 15 cm and base diameter 16 cm is
Options
60π cm2
68π cm2
120π cm2
`136 pi cm^3`
Solution
Height,
`h = 15 cm,`
`r= 16/2`
`= 8 cm`
`l = sqrt(r^2 + h^2)`
`= sqrt(8^2 + 15^2)`
`= sqrt(64 + 225)`
`=sqrt289`
`l = 17 cm`
The C.S.A. of cone
`= pirl`
`=pi xx 8 xx 17`
`=136 pi cm^3`
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