Diagonals of a parallelogram ABCD intersect at O. If ∠BOC = 90° and ∠BDC = 50°, then ∠OAB is equal to ______________

Diagonals of a parallelogram ABCD intersect at O. If ∠BOC = 90° and

1.	Diagonals of a parallelogram ABCD intersect at O. If ∠BOC = 90° and ∠BDC = 50°, then ∠OAB is equal to ______________
A.	90°
B.	50°
C.	40°
D.	10°
Answer» D. 10°

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Diagonals of a parallelogram ABCD intersect at O. If ∠BOC = 90° and ∠BDC = 50°, then ∠OAB is equal to ______________

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