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प्रश्न
The figure shows two circles which intersect at A and B. The centre of the smaller circle is O and lies on the circumference of the larger circle. Given that ∠APB = a°.
Calculate, in terms of a°, the value of : ∠ADB.
Give reasons for your answers clearly.
योग
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उत्तर
Join AB.
∠ADB = ∠ACB = 180° – 2a°
(Angle subtended by the same arc on the circle are equal)
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