Crossed Ladders Theorem
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
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Contributed by:
Jay Warendorff
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Crossed Ladders Theorem
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Parallel
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Parallel Lines
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MathWorld
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"
Crossed Ladders Theorem
" from
The Wolfram Demonstrations Project
http://demonstrations.wolfram.com/CrossedLaddersTheorem/
Contributed by:
Jay Warendorff
High School Geometry
Plane Geometry
Stewart's Theorem
Ptolemy's Theorem
Bottema's Theorem
The Ratio Theorem
Viviani's Theorem
Hjelmslev's Theorem
Napoleon's Theorem
The Pivot Theorem
The Eyeball Theorem
The Carpets Theorem
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