Heptagram

The heptagram, septagram, or hag, is a polygon with 7 sides. It's created by taking the first stellation of a heptagon. A regular heptagram has equal sides and equal angles.

It is one of two regular 7-sided star polygons, the other being the great heptagram. The name "heptagram" is often used to describe either of these two shapes.

Vertex coordinates
Coordinates for a regular heptagram of edge length 2sin(2π/7), centered at the origin, are:


 * (1, 0),
 * (cos(2π/7), ±sin(2π/7)),
 * (cos(4π/7), ±sin(4π/7)),
 * (cos(6π/7), ±sin(6π/7)).