If the circumference of a circle is 18pi centimeters, what us the diameter of the circumference of the circle?

1 answer:

4 0

Hello there!

Now, the formula to find the circumference of a circle is C = 2 $\pi$ r. Now, since the circumference is 18 $\pi$ , all we have to do is to divide 18 by 2 to find the radius!

The radius of the circle is 9 cm, since 18/2 = 9. However, this is the radius. We need the diameter.

Multiply 9 by 2 to find the diameter. 9 · 2 = 18. So the answer is B. 18 centimeters.

Hope this helped!

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