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Mathematics 17 Online
OpenStudy (anonymous):

Quadrilateral DEFG has vertices D(-4,1), E (-2,-3), F (6,-1), and G (2,3) verify that the quadrilateral is a parallelogram. How do you know it is not a rectangle?

OpenStudy (mertsj):

Find the slopes of the opposite sides. If they are the same, then it is a parallelogram.

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