Question

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Q. 2
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O is the circumcentre of ABC and angle OAB = 50° , then what is the value of angle ACB ?

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# Devil king

Answer 1

Join O to A, B and C
All these lines are radii, hence the three little triangles formed are all equilateral. 
 the angles in the original triangle thus sum to 2x,2y,2z which sum to 180
you will discover the sum OBC + BAC is x+y+z 

Answer 2

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