Methods to Prove Problems on Three Points Collinear
证明三点共线问题的方法
Equate to zero the moment sums about three points that are not collinear.
对不共线的三点的力矩的和等于零
The proof of some propositions on points collinear in elementary geometry with vector mothod
用向量法推证几个有关点共线的初等几何命题
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