find the circumcircle of a given triangle
circumcircle(cc, T, cn)
the name of the circumcircle
'centername' = cn
(optional) where cn is a name of the center of circumcircle
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.
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