1.

The sides AB, BC, CD and DA of a quadrilateral are x + 2y = 3, x = 1, x – 3y = 4, 5x + y + 12 = 0 respectively. The angle between diagonals AC and BD is

Answer»

The sides AB, BC, CD and DA of a quadrilateral are x + 2y = 3, x = 1, x – 3y = 4, 5x + y + 12 = 0 respectively. The angle between diagonals AC and BD is



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