JESTION 2: In the diagram. ABCO is a cyclic quadrilateral with BC//AO and AB = OC. A smaller circle centre O passes through A and C. BO produced meets the circle at D. Let AOB = x. 2.1 .2.2 Prove that: 2.1.1 AB/AO 2.1.2 AB D= DB C 0 D Calculate the size of BCO in terms of x. (4) (4). 2.3 If x=35°, prove that AOCD is equilateral (4)​