Q30 of 100 Page 17

In Fig. 16.206, O is the centre of the circle and ∠BDC=42°. The measure of ∠ACB is

∠BDC = 42°

∠ABC = 90° (Angle in a semi-circle)


In ABC,


∠ABC + ∠BAC = 42° (Angles on the same segment)


90o + 42o + ∠ACB = 180°


∠ACB = 48°

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