Question
In the given figure, $A B C D$ is a rectangle whose diagonals intersect at O . Diagonal AC is produced to E and $\angle ECD =140^{\circ}$. Find the angles of $\triangle OAB$.
✓
Answer
$\angle OAB =40^{\circ}, \angle ABO =40^{\circ}, \angle AOB =100^{\circ}$
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