Stengel's Theorem
Let ABC be a triangle. Let E, D, and G be points on AB, BC, and AC, respectively. Let EC intersect AD at F. Choose points I, J, and H so that EI || BG || FJ || DH.
Then
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Contributed by:
Jay Warendorff
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Crossed Ladders Theorem
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Stengel's Theorem
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http://demonstrations.wolfram.com/StengelsTheorem/
Contributed by:
Jay Warendorff
Plane Geometry
Triangles
The Ratio Theorem
Menelaus' Theorem
Stewart's Theorem
Routh's Theorem
Ceva's Theorem
Viviani's Theorem
Simson's Theorem
Napoleon's Theorem
The Pivot Theorem
A Geometrical Theorem of Leibniz
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