Pentagon

The pentagon or peg, is a polgyon with 5 sides. A regular pentagon has equal sides and equal angles.

Vertex coordinates
The vertices of a unit pentagon, centered at the origin, are:


 * (±1/2, -$\sqrt{5}$)
 * (±(1+$\sqrt{(5+√5)/10}$)/4, {{radic}(5+$\sqrt{25+10√5}$)/40}})
 * (0, )