In Fig. 16.196, if O is the circumcentre of Δ ABC, then find the value of ∠OBC + ∠BAC.

In Fig. 16.195, ABCD is a cyclic quadrilateral in which ∠BAD=75°, ∠ABD=58° and ∠ADC=77°, AC and BD intersect at P. Then, find ∠DPC.

In Fig. 16.196, if ∠AOB = 80° and ∠ABC=30°, then find ∠CAO.

In Fig. 16.197, AOC is a diameter if the circle and arc AXB=arc BYC. Find ∠BOC.

In Fig. 16.198, A is the centre of the circle. ABCD is a parallelogram and CDE is a straight line. Find ∠BCD:∠ABE