### All SAT Math Resources

## Example Questions

### Example Question #111 : Circles

Let represent the area of a circle and represent its circumference. Which of the following equations expresses in terms of ?

**Possible Answers:**

_{}

_{}

_{}

_{}

**Correct answer:**

_{}

Explanation:

The formula for the area of a circle is , and the formula for circumference is . If we solve for C in terms of r, we get

.

We can then substitute this value of r into the formula for the area:

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