Relation of a cylinder to a prism
A prism is a solid with bases that are polygons and the sides are flat surfaces.
(See Definition of a prism). Strictly speaking a cylinder is not a prism, however it is extremely similar.
If you imagine a prism with regular polygons for bases, as you increase the number of sides, the solid gets to look just like a cylinder.
So we can say that a cylinder is a prism with an infinite number of faces.
In the applet above, keep clicking on 'more' to see this effect. This is similar to the way a regular polygon turns into a circle when the number of sides gets infinitely large. See Area of a circle derivation.
A cylinder is also similar to a prism in that
 It has the same cross section anywhere.
 Its volume is calculated by multiplying the area of a base by the height.
 It can be right or oblique.
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