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If a quadrilateral ABCD is inscribed into a circumference.

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If a quadrilateral ABCD is inscribed into a circumference. [#permalink] New post 30 Apr 2007, 02:31
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If a quadrilateral ABCD is inscribed into a circumference. What is the value of angle A?

(1) AC = CD
(2) angle D = 70 degree
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 [#permalink] New post 30 Apr 2007, 07:01
I think the answer is that both are not sufficient to find the angle of A. The property to be used here is that sum of opposite angles inscribed is equal to 180.
A+C = 180 and B+D=180. But this is not sufficient to solve the problem.

Ans:E
  [#permalink] 30 Apr 2007, 07:01
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If a quadrilateral ABCD is inscribed into a circumference.

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