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Question
In the following figure, O is the centre of the circle. Find the values of a, b, c and d
Solution
∠AOB = 2∠AOB
= 2 × 50°
= 100°
(Angle at the centre is double the angle at the circumference subtended by the same chord)
Also, OA = OB
`=>` ∠OBA = ∠OAB = C
∴ `c = (180^circ - 100^circ)/2 = 40^circ`
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