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5 points to convex quad (Posted on 2009-10-05) Difficulty: 2 of 5
Given 5 coplanar points with no three collinear, prove that there must be a subset of 4 points that form a convex quadrilateral.

See The Solution Submitted by Jer    
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  Subject Author Date
re: another proofCharlie2009-10-07 12:06:19
Hints/Tipsre: another proof (tiny problem)Jer2009-10-06 17:52:27
Solutionanother proofCharlie2009-10-06 11:22:51
SolutionSolutionBractals2009-10-05 16:25:50
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