\begin{ccRefFunction}{squared_radius}

\ccFunction{FT
squared_radius( const Point_2<R>& p,
                const Point_2<R>& q,
                const Point_2<R>& r);}
 {compute the squared radius of the circle passing through the points
 $p$, $q$, and $r$.  \ccPrecond $p$, $q$, and $r$ are not collinear.}

\ccFunction{FT
squared_radius( const Point_3<R>& p,
                const Point_3<R>& q,
                const Point_3<R>& r);}
 {compute the squared radius of the sphere passing through the points $p$,
 $q$, and $r$ and whose center is in the same plane as those three points.}

\ccFunction{FT
squared_radius( const Point_3<R>& p,
                const Point_3<R>& q,
                const Point_3<R>& r,
                const Point_3<R>& s);}
 {compute the squared radius of the sphere passing through the points $p$,
 $q$, $r$ and $s$.  \ccPrecond $p$, $q$, $r$ and $s$ are not coplanar.}

\end{ccRefFunction}
