The Trilinear Coordinates
of a point relative to a Triangle are Proportional
to the directed distances from to the side lines (i.e, , , ). Letting
be the constant of proportionality,

where is the Area of and , , and are the lengths of its sides. When the trilinears are chosen so that , the coordinates are known as exact trilinear coordinates.

© 1996-9

1999-05-25