The volume of the cone is 100pi cm and its height is 12cm. Find its radius and its surface area.
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The volume of the cone is 100pi cm and its height is 12cm. Find its radius and its surface area.

[From: ] [author: ] [Date: 11-05-12] [Hit: ]
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volume of the cone = 1/3 * pi * r^2 * h
=> 100pi=1/3 * pi * r^2 * 12
r=√(100pi/4pi)=5

slant height = √(12^2 + 5^2)=13

SA=(pi * 5 * 13) + (pi * (5)^2)=90pi
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