The largest possible circle that can be drawn interior to a plane
For a polygon, a circle is not actually inscribed unless each side of
the polygon is tangent to the circle.
Note: All triangles have inscribed
circles, and so do all regular polygons.
Most other polygons do not have inscribed circles. For a regular polygon,
the inradius (the radius of
the inscribed circle) is called
Inscribed Circle of a Triangle
Incenter, inradius, circumcircle, centers
of a triangle