The diagonals of a parallelogram PQRS intersect at O. If ∠QOR = 90o and ∠QSR = 50o, then ∠ORS is:
90o
50o
40o
70o
The diagonals of a parallelogram ABCD intersect at O. If BOC=90∘ and ∠BDC=50∘ then ∠OAB=
The diagonals of a parallelogram ABCD intersect at O. If ∠BOC=90∘ and ∠BDC=50∘, then ∠OAB(a) 40∘(b) 50∘(c) 10∘(d) 90∘