Area of Triangle in Terms of Circumradius

Theorem
Let $\triangle ABC$ be a triangle whose sides are $a$, $b$ and $c$ opposite vertices $A$, $B$ and $C$ respectively.

Then the area $\AA$ of $\triangle ABC$ is given by:
 * $\AA = \dfrac {a b c} {4 R}$

where $R$ is the circumradius of $\triangle ABC$.

Also presented as
This can also been seen in some sources presented as:
 * $R = \dfrac {a b c} {4 \AA}$