Which of the following represent the diameters of the circle with center O?
The diameter of a circle is a line segment which passes through the center of the circle and whose endpoints lie on the circle.
AB and PQ are the diameters of the circle.
In the following figure, PQ is the tangent to the circle at A, DB is the diameter and O is the centre of the circle. If ∠ADB = 30o and ∠CBD = 60o, calculate :
(i) ∠ QAB,
(ii) ∠ PAD,
(iii) ∠ CDB.