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Collinearity proof (Posted on 2016-10-01) Difficulty: 3 of 5
If two triangles ABC and abc are oriented so that lines Aa, Bb, and Cc meet at a point, then the pairs of corresponding sides (AB and ab; BC and bc; and AC and ac) will meet in three collinear points.

Prove it.

No Solution Yet Submitted by Ady TZIDON    
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If you want a proof, do a Google search on

"Proof of Desargues theorem".

  Posted by Bractals on 2016-10-30 04:53:00
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