A and B are points on the circle with centre O. If a chord CD of the circle subtends an angle of 50° at the point A on the circle and ∠BDC = 70°, then ∠BCD equals:
60°
50°
70°
70°
A.
60°
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In the given figure, ∠AOB = 90° and ∠ABC = 30°, then ∠CAB is equal to:
30°
105°
90°
90°
In the circle with centre O, ∠AOB = 60° and ∠BOC = 30°, the measure of ∠ADC is:
30°
45°
60°
60°
In the adjoining figure, O is the centre of the circle and P, Q and R are points on the circle such that ∠PQR = 100°, then ∠OPR equals:
80°
10°
100°
100°
Given a circle with centre O and smallest chord AB is of length 6 cm and the longest chord CD of the circle is of length 10 cm, then the radius of the circle is: