The area of a circle is 'pi' multiplied by the square of the circle's radius.
The volume of a circle is zero.
The volume of a sphere is (4/3 pi) multiplied by the cube of the sphere's radius.
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circle does not have volume
There is none because a circle has no volume but the area of a circle is pi*radius^2
circumference is the perimeter of a circle. a circle is 2 dimensional. volume is 3 dimensional. you need to state what shape it is. I could guess that you are talking about a cylinder. the volume is pi.r2.h, if you find the radius from the volume, you can find the perimeter of the circle by 2.pi.r
A circle has no volume. It is a planar figure and is flat, and it has no thickness. A circle does not have any thinkness just as a plane, the construct on which it is drawn, has no thickness.
A circle has neither mass not volume so its density is not defined.