In quadrilateral PQRS, if ∠P = 60o and ∠Q : ∠R : ∠S = 2 : 3 : 7, then ∠S =
210o
150o
175o
135o
If angles P,Q,R and S of the quadrilateral PQRS taken in order are in the ratio 3:7:6:4 then PQRS is a