In the figure,O is the centre of the circular arc ABC.Find the angles of triangle ABC

Q. In the figure, O is the centre of the circular arc ABC. Find the angles of triangle ABC

                    

160
 
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160 ans ok ok o k o k o k o k 
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answer
if that is a triangle where 2 sides are equal
therefore
30 + 40 + x +x = 180
2x = 180-70
x=55
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