Noun
circumradius (plural circumradii)
(mathematics) For a given geometric shape, the radius of the smallest circle or sphere into which it will fit.
The circumradius of the unit square is one-half the square root of two.
Euler's theorem states that the distance d between the circumcenter and the incenter is given by : p.85 : or equivalently : where R is the circumradius and r is the inradius. Source: Internet
The radii of these spheres are called the circumradius, the midradius, and the inradius. Source: Internet
The radius of the twelve-point sphere is one third of the circumradius of the reference tetrahedron. Source: Internet