*Problem #66*

A triangle sits in three-space. When it is projected (orthogonally) into
the *xy*-plane, its shadow has an area of *A* square units. When
it is projected into the *xz*-plane, its shadow has an area of
*B* square units.When it is projected into the *yz*-plane, its
shadow has an area of *C* square units.
What is the area of the triangle?