In the given figure, AB is the diameter of the circle, with centre O, and AT is the tangent, Calculate the numerical value of x.
In ΔOBC,
OB = OC (Radii of the same circle)
AB is the diameter of the circle with centre O. OD is parallel to BC and ∠ AOD = 60o, Calculate the numerical values of :
(i) ∠ ABD ,
(ii) ∠ DBC,
(iii) ∠ ADC.