The circumcircle cc of a triangle T is a circle circumscribed about the triangle.

If the optional argument is given and is of the form 'centername' = cn where cn is name, cn will be the name of the center of cc.

For a detailed description of the circumcircle cc, use the routine detail (i.e., detail(cc);)

Note that the routine only works if the vertices of the triangle are known.

The command with(geometry,circumcircle) allows the use of the abbreviated form of this command.