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प्रश्न
In the figure, quadrilateral ABCD is a cyclic. If ∠DAB = 75°, then find measure of ∠DCB.
योग
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उत्तर
In ▢ABCD,
∠DAB = 75° ...[Given]
∠DAB + ∠DCB = 180° ...[Opposite angle of cyclic quadrilateral are supplementary]
∴ 75° + ∠DCB = 180°
∴ ∠DCB = 180° – 75°
∴ ∠DCB = 105°
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