Menelaus' Theorem
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In triangle ABC, let a line DEF intersect the two sides AC and BC and an extension of AB at F, E, and D. Then ADBE
CF = BD
CE
AF.
Contributed by: Jay Warendorff (March 2011)
Open content licensed under CC BY-NC-SA
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"Menelaus' Theorem"
http://demonstrations.wolfram.com/MenelausTheorem/
Wolfram Demonstrations Project
Published: March 7 2011