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The diameter of a circle is 6 inches find the volume?
A circle is a two-dimensional object. Two-dimensional objects do not have volumes. Perhaps you were thinking of a sphere?
What is the volume of a circle if its radius equals 4?
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.
If the radius of a circle is doubled what happens to its volume?
A circle does not have volume since it is a 2 dimensional shape. Volume requires 3 dimensions.
Why is the volume pi r h for a cylinder?
pi r^2 h is used to determine the volume of a cylinder because when determing the area of a shape you first have to determine the area of the the base of the object and then multiply it by the height. The base of a cylinder is a circle and to find the area of a circle you use pi r^2 and hence the reason why pi r^2 is used to find the volume of the cylinder.
How are the formulas for the area of a circle and the volume of a cylinder related?
The volume of a cylinder is the cross-sectional area of the cylinder multiplied by its length. The perpendicular cross-section of a cylinder is a circle.
