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Quadrilateral ABCDABCDA, B, C, D has the following vertices: A(-6,-2)A(−6,−2)A, left parenthesis, minus, 6, comma, minus, 2, right parenthesis B(-4,4)B(−4,4)B, left parenthesis, minus, 4, comma, 4, right parenthesis C(8,1)C(8,1)C, left parenthesis, 8, comma, 1, right parenthesis D(6,-6)D(6,−6)D, left parenthesis, 6, comma, minus, 6, right parenthesis Also, \angle A∠Aangle, A is a right angle. Is quadrilateral ABCDABCDA, B, C, D a rectangle, and why?