Question
Volume of a right circular cone having base radius 70 cm and curved surface area 40040`cm^2` is :
Answer: Option D
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`22/7 xx 70 xx l = 40040`
`rArr l = ((40040 xx 7)/(22 xx 70))` = 182
Now , l = 182 cm , r = 70 cm
So , h = `sqrt((182)^2 - (70)^2) = sqrt(252 xx 112) ` = 168 cm .
`:.` Volume = `(1/3 xx 22/7 xx 70 xx 70 xx 168) cm^3= 862400 cm^3`
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