Asphere and a cylinder have the same radius and height. the volume of the cylinder is what is the volume of the sphere?

Formulas for calculating:

sphere's volume - ;

cylinder's volume - .

Note that h=2r (height of the sphere consists of two radius).

Then .

Since you have that and .

You have only to substitute correct number for .

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the first one, all those points on the line just make a strait line.