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ABcd is a cyclic Quadrilateral such that a=90and b=70 so find that angle c and d?
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ABcd is a cyclic Quadrilateral such that a=90and b=70 so find that ang...
In a cyclic quadrilateral, the sum of opposite angles is 180�. 
Now, ∠A + ∠C = 90� + 90� = 180� and ∠B+∠D = 70� + 110� =180� (Assuming that A and C are the opposite angles and B and D are the opposite angles)
 Here, we see that the sum of opposite angles is equal to 180�. So, it is a cyclic quadrilateral.
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ABcd is a cyclic Quadrilateral such that a=90and b=70 so find that angle c and d?
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