Area of Triangle (when length of sides is known)

Added by Terence Farrell on February 15, 2002 at 01:49:30:

Area of Triangle when the length of the three sides is known =

1/4 * square-root [ P * (P-2a) * (P-2b) * (P-2c)]

where P is total perimeter
and a, b and c are the lengths of the three sides.