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Mathematics 22 Online
OpenStudy (anonymous):

Find a counterexample for the conjecture three coplanar lines always make a triangle

OpenStudy (agreene):

|dw:1330359074164:dw| the box represents a 2d plane, clearly the 3 coplanar lines do not make a triangle.

OpenStudy (agreene):

In words, 3 parallel lines, will never form a triangle

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