Question
If the area of the base of a right circular cone is 3850 `cm^2` and its height is 84 cm then the curved surface area of the cone is :
Answer: Option B
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`pi r^2` = 3850`
`rArr r^2 = ((3850 xx 7)/(22)) = 1225`
rArr r = 35`
Now , r = 35 cm, h = 84 cm.
So, ` l = sqrt((35)^2 + (84)^2) = sqrt(1225 + 7056) = sqrt(8281) = 91 cm`
`:.` Curved surface area = `(22/7 xx 35 xx 91) cm^2 = 10010 cm^2`
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