Pentagon

The pentagon or peg, is a polygon 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, $\sqrt{25+10√5}$),
 * (0, $\sqrt{(5+2√5)/20}$).