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10. In parallelogram \( ABCD , \angle DAC =44^{\circ} \) and \( \angle CBD =46^{\circ} \) then \( \angle AOB = \) : (A) \( 80^{\circ} \) (B) \( 90^{\circ} \) (C) \( 85^{\circ} \) (D) \( 95^{\circ} \)

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in Quadrilaterals by (15 points)
10. In parallelogram \( ABCD , \angle DAC =44^{\circ} \) and \( \angle CBD =46^{\circ} \) then \( \angle AOB = \) : (A) \( 80^{\circ} \) (B) \( 90^{\circ} \) (C) \( 85^{\circ} \) (D) \( 95^{\circ} \)
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(b) 90°

as diagonals of parallelogram are perpendicular to each other
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