.The diagonals of a parallelogram ABCD intersect at O. If ∠BOC = 90° and ∠BDC = 50°, then ∠OAB =

In a rhombus ABCD, if ∠ACB = 40°, then ∠ADB =

ABCD is a parallelogram in which diagonal AC bisects ∠BAD. If ∠BAC = 35°, then ∠ABC=

. If the degree measures of the angles of quadrilateral are 4x, 7x, 9x and 10x, what is the sum of the
measures of the smallest angle and largest angle?

. ABCD is a parallelogram, M is the mid-point of BD and BM bisects ∠B. Then ∠AMB =

40°

50°

110°

168°

90°