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Toolkit 85

Menelaus' Theorem

Menelaus configuration with transversal cutting triangle ABC
Menelaus configuration with transversal cutting extensions
DBDC⋅ECEA⋅FAFB=1\frac{DB}{DC}\cdot\frac{EC}{EA}\cdot\frac{FA}{FB}=1

if and only if D,E,FD,E,F are collinear.

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