Question
In the given figure, ABCD is a rectangle in which diagonal AC is produced to E. If $\angle\text{ECD}=146^\circ,$ find $\angle\text{AOB}.$
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$i. 40$ years or more.
$ii.$ Under $40$ years.
$iii.$ Having age from $30$ to $39$ years.
$iv.$ Under $60$ but over $39$ years.