Question by  Che (425)

If the radius of a circle is 30, what is the circumference?

I need to know the circumference of a circle with a radius of 30.


Answer by  BranandMike (148)

Thr formula for circumference of a circle is circumference equals pi times the diameter. If the radius of your given circle is 30, then the diameter would be 60. 60 times pi, pi is 3. 14, will give you your answer. Here is your problem, 60 x 3. 14 is 188. 4. The answer is 188. 4.


Answer by  Joven (163)

Since we know that the circumference of a circle is equal to 2 Pi times the radius, we can put in 30 in for the radius and we will get out the circumference being 60 Pi. The 2 Pi is used because we want the length of the whole circle.

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