Menelaus' Theorem

Revision as of 19:41, 18 June 2006 by SnowStorm (talk | contribs)
(diff) ← Older revision | Latest revision (diff) | Newer revision → (diff)

Statement

(awaiting image) A necessary and sufficient condition for points D, E, F on the respective side lines BC, CA, AB of a triangle ABC to be collinear is that


$BD*CE*AF = -DC*EA*FB$


where all segments in the formula are directed segments.


Example

Does anyone have a good example?

Invalid username
Login to AoPS