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प्रश्न
In following figure . O is the centre of the circle. Find ∠ BAC.
बेरीज
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उत्तर
BOC is the diameter of circle,
∴ ∠ BOC = 180°
Since are BC makes ∠ BOC at the centre and ∠ BAC on the remaining part of the circle.
∴ ∠ BAC = `1/2` ∠ BOC
∴ ∠ BAC = `1/2 xx 180 = 90 ^circ`
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