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Quadrilateral ABCD has vertices A (-3,-2), B(9,2), C(1,6), and D (-5,4). Using coordinate geometry, can you prove that quadrilateral ABCD is a trapezoid and contains a right angle? - Quora

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Quadrilateral ABCD has coordinates A (-1,3) B(4,4) C (5,-3) D (-2,-2). How can you use coordinate geometry to prove that the diagonals are perpendicular? - Quora

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