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प्रश्न
In the following figure, O is the centre of the circle. Find the values of a, b and c.
उत्तर
Here, `b = 1/2 xx 130^circ`
(Angle ate he centre is double the angle at the circumference subtended by the same chord)
`=>` b = 65°
Now, a + b = 180°
(Opposite angles of a cyclic quadrilateral are supplementary)
`=>` a = 180° – 65° = 115°
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