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The area of a triangle
Given a triangle ABC, remember that the length of the vector
product AB
AC 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