Crossed Ladders Theorem
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Let AB and EF be parallel. Let D be the intersection of BE and AF. Let the parallel to AB through D intersect AE at C. Then .
Contributed by: Jay Warendorff (March 2011)
Open content licensed under CC BY-NC-SA
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"Crossed Ladders Theorem"
http://demonstrations.wolfram.com/CrossedLaddersTheorem/
Wolfram Demonstrations Project
Published: March 7 2011