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Let A be the centre of the circle x2+y2−2x−4y−20=0. Suppose that the tangents at the points B(1,7) and D(4,−2) on the circle meet at point C. Then the area of the quadrilateral ABCD is

Answer» Let A be the centre of the circle x2+y22x4y20=0. Suppose that the tangents at the points B(1,7) and D(4,2) on the circle meet at point C. Then the area of the quadrilateral ABCD is


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