Homework Help: geometry

Posted by Piggy on Saturday, May 5, 2012 at 3:20pm.

The surface area of a cone is 38 in^2. The radius of a similar cone is triple the radiusof the orginal cone. What is the surface area of the new cone?

geometry - MathMate, Saturday, May 5, 2012 at 11:16pm
Similar cones have area proportional to the square of the linear dimensions.
So if the new cone has three times the radius, the area is 3²=9 time that of the original cone.

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