Show that the quadrilateral with vertices (1, 4), (-2, 1), (0, -1) and (3, 2) is a parallelogram.
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if the distance between first two co-ordinates is equal to distance between all the coordinates then it is a quad. and if minimum one pair of opposite side are parallel and equal then it is parallelogram...
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the for your question is
let all points given is represents as A,B,CD distance between A and B is √18 and distance of B C is also same and distance between A C and BD is also same so it is a parallelogram
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