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Question -

In the given figure, ΔABC is an equilateral triangle. Find m∠BEC.



Answer -

It is given that,   is an equilateral triangle
 
We have to find  
Since   is an equilateral triangle.
So  
And
  …… (1)
Since, quadrilateral BACE  is a cyclic qualdrilateral

So ,                                          (Sum of opposite angles of cyclic quadrilateral is .)
 
Hence
 

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