The formula is:
Volume of a circle = 0
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A circle is two dimensional, it has area but not volume.
The formula that expresses the volume of a circle isV = 0 .A circle is a 2-dimensional (flat) shape, so it has no volume.
There is none because a circle has no volume but the area of a circle is pi*radius^2
A semi-circle is a 2-dimensional figure and so cannot have a volume.
The formula for area of a circle is radius squared times pi. The formula for volume of a cylinder is radius squared times pi times height.