A CD, because it exists in our dimension, has three distinct points you can measure therefor it is a cylinder.
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circle and rectangle. circle for the top and a curled rectangle with length equal to the circumference of the circle for the side.
A circle is a two-dimensional figure, where the cylinder and cone are three-dimensional.
Circle
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.
When you horizontally cut a cylinder, you will see a circle as the resulting 2D shape. This circle is formed by the intersection of the plane (the cut) with the curved surface of the cylinder. The circle will have the same diameter as the base of the cylinder.