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Question -

In the given figure, if ∠BAC = 60° and ∠BCA = 20°, find ∠ADC.



Answer -

It is given that,  and  
 
We have to find the  
In given   we have
In cyclic quadrilateral   we have
          (Sum of pair of opposite angles of a cyclic quadilateral is 180º)
Then,
 
Hence  

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