College Math CLEP Prep Practice Exam

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What is the formula to calculate the surface area of a cone?

2πrh
1/3πr^2h
1/3πr^2
2πr^2h

The correct answer is: 1/3πr^2h

The formula to calculate the surface area of a cone is B 1/3πr^2h. Option A: 2πrh is the formula for the lateral surface area of a cone, which does not include the base. Option C: 1/3πr^2 is the formula for the volume of a cone, not the surface area. Option D: 2πr^2h is the formula for the lateral and base surface area of a cylinder, not a cone. Therefore, the correct formula for the surface area of a cone is B: 1/3πr^2h.