Difference between revisions of "Menelaus' Theorem"
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Revision as of 21:35, 14 October 2007
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Menelaus' Theorem deals with the collinearity of points on each of the three sides (extended when necessary) of a triangle. It is named for Menelaus of Alexandria.
Statement
A necessary and sufficient condition for points 
on the respective side lines 
of a triangle 
to be collinear is that
where all segments in the formula are directed segments.
