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Let A be the centre of the circle `x^(2)+y^(2)-2x-4y-20=0` .The tangents at the points B(1,7) and C(4,-2) on the circle meet at the point D .If `Delta ` denotes the area of the quadrilateral ABCD,then `(Delta)/(25)` is equal to

A

150 sq. units

B

50 sq. units

C

75 sq. units

D

70 sq. units

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The correct Answer is:
C
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