There is no volume in a circle but volume can be found in a sphere.
The question should be rephrased.
A circle is a two dimensional shape, so it cannot have a volume which is a characteristic of a three dimensional shape.
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if a radius is 5cm the diameter is 10cm rule- you double the radius
A circle has no volume; it is a 2D shape. If you mean a sphere, then the formula is V = (4/3)πr3 where V is volume, π is pi (~3.14) and r is radius.
8 units; the diameter of a circle is twice its radius.
4 cm radius = Area of 50.26548 sq. cm.
Length of a radius is always half the diameter of a circle. This means that the circle has a radius of 2cm.