In a circle with centre O, AB is a chord such that ∠AOB=136∘. Use this information to answer the following.
a. (a) Point C lies on the minor arc AB. Calculate ∠ACB.
b. (b) Point D lies on the major arc AB. Find the reflex angle ∠ADB (the larger angle at D).
c. (c) Another chord PQ satisfies AB=PQ. Determine the measure of ∠POQ.