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If by circle you mean sphere, then the volume of a sphere is:

4/3 * pi * radius^3.

If you already know the volume, then here's what you do:

1. Multiply the volume by 3/4.

2. Divide the volume by pi.

3. Take the cube root of both sides

In other words, the formula for radius when volume is known is:

( ( Volume * 3 ) / ( 4 * pi ) ) ^ (1/3)

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Q: What is the formula for finding the radius of a circle when you have the volume?
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