O is the centre of the circle. If OAB is 20° and OCB is 55° then BOC is ?
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OAB = 20° (given)
OCB = 55° (given)
OBA = 20° ( isosceles triangle)
OBC = 55° (isosceles triangle )
therefore,
BOC = 180 - (55 + 55)
= 180 - 110
= 70°
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