In the figure O is the centre of the circle passing through points A, B and C. Find X.
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Step-by-step explanation:
as OB = OC = radius of circle
OBC is an isosceles triangle
angle OBC = angle OCB = 40 degrees
as sum of all angles in a triangle = 180 degrees
angle BOC = 180 - 40 - 40
= 140 degrees
similarly angle BOA = 120 degrees
angle OAC = 360 - 120 - 140 degrees
= 100 degrees
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