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Given a triangle ABC, remember that the length of the vector
product **ABAC** is the area of the parallelogram ABDC.

We then have: *area of triangle = half the area of
parallelogram* = . A simple
calculation proves that this formula gives the same value as the
following: .

copyright 2000 et seq. maddalena falanga & luciano battaia

first published on march 15 2002 - last updated on september 01
2003