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Question
In fig., O is the centre of the circle and ∠ AOC = 1500. Find ∠ ABC.
Solution
∠ AOC = 150 °
Reflex ∠ .AOC = 360° - 150° = 210°
∠ ABC = `1/2` reflex ∠ AOC = `1/2` (210°}
∠ ABC= 105°
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