Question

AB is parallel to CD and OA is the transversal of them If angle aoc = 30 degree and angle oab = 110 degree then angle ocd= ?

Answer 1

In the question
it is given that
AB is parallel to CD

and  Angle OAB = 110 deg
also  Angle AOC = 30 deg

Thus angle OCD = 30/2 = 15 deg
Thus 

angle OCD = 15 deg