BC is a chord of a circle with centre O. If A is a point on major arc BC as shown in the figure, then ∠BAC+∠OBC= ___________.
BC is a chord with centre O. A is a point on an arc BC as shown in the figure. Prove that:
BC is chord of a circle with centre O. A is a point on major arc BC. Find the total measure of ∠BAC and ∠OBC.