Quadrilateral ABCD such that AB=AD and BC=BD
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The pair of coincident lines in the following are x - 2y = 0; 3x + 4y = 20 . x + 2y = 4; 2x + 4y = 12 (B)2x + 3y = 9; 4x + 6y = 18; x + y = 8; x - y = 4
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