In the given figure, PQRS is a parallelogram and ∠R is 100o then ∠Q is
80o
90o
70o
100o
The adjacent angles of a parallelogram are supplementary.
∠R + ∠Q = 180o
1000 + ∠Q = 180o
∠Q = 80o
In the given figure, ABCD is a parallelogram, then ∠CDB is: