Homework Help: Solid Mensuration

Posted by Paul on Friday, March 2, 2012 at 5:26am.

Two similar cones have volumes 81pi/2 in^3 and 12pi in^3 and slant height of the bigger cone is 7.5 in. Find the integer solution to the height of the similar cone.

Solid Mensuration - Steve, Friday, March 2, 2012 at 2:58pm
bigV/smallV = 81/2 / 12 = 81/24 = (3/2)^3
volumes are in the ratio x^3:1 if the sides are in ratio x:1

so,

bigH/smallH = 3/2

so, 7.5/smallH = 1.5, and smallH = 5

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