Question

The section of a right circular cone by a plane through its vertex perpendicular to the base is an equilateral triangle of side 30cm.find the volume of the cone

Answer 1

r = 30/2 =15 cm
l =30cm
so, h =√(30^2 -15^2) =√675 cm =15√3 cm
so ,
volume of cone =πr^2h/3
=π(15)^2(15√3)/3
=(π/√3)(15)^3 cm^3

Answer 2

here is the answer
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