251.If A (-5, 7), B(-4, -5), C(—1, —6) and D(4, 5) are the vertices of a quadrilateral, find the area of the quadrilateral ABCD.
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252.Find the area of the quadrilateral the co-ordinates of whose vertices are (1, 2), (6, 2), (5, 3) and (3, 4).
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253.If A(-3, 2), B(5, 4), C(7, -6) and D(-5, 4) arc the vertices of a quadrilateral, find the area of the quadrilateral ABCD.
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254.Find the area of the triangle formed by joining the mid-points of the sides of the triangle whose vertices are (0, -1), (2, 1) and (0, 3). Find the ratio of the triangle formed to the area of the given triangle.