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Didn't know it was lost!

To find the radius of a sphere you first need to know what information you do have. If none, then the easiest way is to measure the volume using water displacement.

Then V = 4/3*pi*r3 so that r = cube root of 3V/4pi

The diameter is not that easy to measure because it is the distance between two parallel tangential planes to the sphere. It is very difficult to ensure that the planes are truly parallel.

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Q: Find the radius of a sphere?
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