Q: What is the formula for a volume of an circle?

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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.

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A circle is two dimensional, it has area but not volume.

There is none

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.

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.

Volume of a sphere = 4/3*pi*radius3 Area of a circle = pi*radius2

Technically, a circle is a 2-dimensional object, so the question should read "volume of a sphere" OR "Area of a circle". The formula to work out the volume of a sphere is: 4/3 pi x r3, where "r" is the radius of the sphere. To find the area of a circle: pi x r2.

Wouldn't a circle-based pyramid look a lot like a cone ? If so, you could probably use the formula for the volume of a cone and get away with it.

The formula for working out a cylinder is... pie radius squared times height The pie radius squared works out the area of one of the circle faces, and then multiplying it by the height sort of stretches out the circle face to the cylinder's exact volume

The formula to calculate the weight of a circle plate is weight = density x volume, where density is the material density and volume is calculated as π x (radius^2) x thickness.