# HSPT Math : Concepts

## Example Questions

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### Example Question #2125 : Hspt Mathematics

A sphere has diameter 12. What is 75% of its surface area?

Explanation:

The radius of a sphere is half its diameter, which here is 12, so the radius is 6. The surface area of the sphere can be calculated by setting  in the formula:

75% of this is

### Example Question #2126 : Hspt Mathematics

Which expression is equal to 40% of the surface area of the above cylinder?