Rectangle

The rectangle, or rect, is a semiuniform quadrilateral with 2 pairs of opposite parallel sides. All interior angles of a rectangle measure 90º.

Vertex coordinates
Coordinates for the vertices of a rectangle with side lengths a and b, centered at the origin, are:
 * (±a/2,±b/2).

Measures
The area of a rectangle with side lengths a and b is ab. Its circumradius is $\sqrt{a^{2}+b^{2}}$/2.