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प्रश्न
In the given figure, AOB is a diameter and DC is parallel to AB. If ∠ CAB = xo ; find (in terms of x) the values of: ∠ DAC
उत्तर
∠DAC = `1 /2 ` ∠DOC = `1/2 (180° - 4x ) = 90° - 2x `
(Angle at the centre is double the angle at the circumference subtended by the same chord)
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