Authors: Florentin Smarandache
Let’s consider the points A1,...,An situated on the same plane, and B1,...,Bn situated on another plane, such that the lines A1B1 are concurrent. Let’s prove that if the lines AiAj and BiBj are concurrent, then their intersecting points are collinear.
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[v1] 2016-07-18 06:39:23
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