Question

In the given figure, O is the centre of a circle, BC is a diameter and ∠BAO = 60°. Then, ∠ADC = ?
(a) 30°
(b) 45°
(c) 60°
(d) 120°

Answer 1

(c) 60°

OA = OB
∠ABO = ∠BAO = 60°
∴ ∠ADC = ∠ABO = 60° (Angles in the same segment)