Menelaus’ Theorem

Menelaus’ theorem, named after Menelaus of Alexandria, is a proposition about triangles in plane geometry. Given a triangle ABC, and a transversal line that crosses AB, AC, and BC at points X, Y, and Z respectively, then (AX/XB) x (BZ/ZC) x (CY/YA) = 1. (In vector version, the RHS is -1)

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