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Quadrilaterals

Quick practice

Question 1 of 5

The diagonals  AC  and BD  of a parallelogram intersect at O. If \angle A D O=40^{\circ} and \angle A OB=100^{\circ}, find  \angle DOA

A

30^{\circ}

B

60^{\circ}

C

50^{\circ}

D

40^{\circ}

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