“Menelaus’ Theorem”的概念、定义、翻译、参考文献-科学参考

单词	Menelaus’ Theorem
释义	Menelaus’ Theorem Mathematics Let L, M, and N be points on the sides BC, CA, and AB of a triangle (possibly extended). Then Menelaus’ Theorem states that L, M, and N are collinear if and only if $\frac{B L}{L C} \cdot \frac{C M}{M A} \cdot \frac{A N}{N B} = - 1.$ (Note that BC, for example, is considered to be directed from B to C so that LC, for example, is positive if LC is in the same direction as BC and negative if it is in the opposite direction.) Compare Ceva’s Theorem.
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