Extra
Information
A regular polygon is one which has
all its edges the same length, and all its vertex angles the same size. The circumcircle
is the circle drawn around the outside of the polygon so as to touch all its
vertices (or corners). Its radius is the CIRCUMradius. The incircle
is the circle drawn around the inside of the polygon so as to touch all its
edges. Its size is given here by the INradius. Polygons are named by the number of edges (or
vertices) they have. Some of the most commonly used names are:
Edges   Name  3   triangle  4   quadrilateral  5   pentagon  6   hexagon  7   heptagon  8   octagon  9   nonagon  10   decagon  11   undecagon  12   dodecagon 
