4. March 2015 In the diagram, the circle with centre O passes through A, B, C and D. AB || DC and BOC = 110°. The chords AC and BO intersect at E. EO, BO, CO and BC are joined. Calculate the size of the following angles, giving reasons for your answers: a) D b) Â c) Ez d) Prove that BEOC is a cyclic quadrilateral. 5.
