**A circle has an area of 81 π in2. Which of the following is the circumference of the circle in terms of pi ( π)?**

4.5 π in

14 π in

18 π in

9 π in

*Correct Answer : C*

we need to find the circumference of the circle from the given area.

The first step is to find the radius of the circle using the given area. Let r be the radius of the circle, then:

Substituting the value of area in the above equation becomes

Dividing both sides by pi and taking square root on both sides yields

Now, we know the radius of circle to be 9 in, the circumference of the circle becomes,

* * in.

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