yayamama
02182009, 01:03 PM


A polygon is a closed plane figure bounded by three or more line segments. Three or more means that then number of sides can be as large as you like. A circle is actually the limiting figure for an nsided polygon as n increases without bound. In other words, it is perfectly proper to say that a circle is an infinitesided polygon.
So, we have established that faces must be flat and faces must be polygons and that a circle is, in fact, a polygon. Therefore a right circular cylinder has two faces. In fact, we can generalize even further to include oblique cylinders and cylinders where the base is elliptical rather than circular.
