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The points A (-5, 4), B (-1, -2) and C (5, 2) are the vertices of an isosceles right-angled triangle where the right angle is at B.

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The points A (-5, 4), B (-1, -2) and C(5, 2) are the vertices of an isosceles right-angled triangle where the right angle is at B. Find the coordinates of D so that ABCD is a square.

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In squares the diagonals are equal and bisect each other 

∴ Mid point of BD = Mid point of AC

∴ The vertex D(x, y) = (1, 8)

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