Trisquare

The trisquare is a polygon compound composed of 3 squares. As such it has 12 edges and 12 vertices.

It is the second stellation of the dodecagon.

Vertex coordinates
Coordinates for the vertices of a trisquare of edge length 1 centered at the origin are given by:
 * (±$\sqrt{2}$/2, 0),
 * (0, ±$\sqrt{2}$/2),
 * (±$\sqrt{2}$/4, ±$\sqrt{2}$/4),
 * (±$\sqrt{2}$/4, ±$\sqrt{6}$/4).