Question

In the given figure, lines $\text{AB and CD}$ intersect at point$\text{O}$.​
Name all the pairs of vertically opposite angle

Answer 1

Step : Finding pairs of vertically opposite angle.
Line $\text{AB and CD}$intersect at point$\text{O}$
Now we know that, when two straight lines intersect, the angles on the opposite sides of their point of intersection are called vertically opposite angles.
From figure we have,
Vertically opposite angle are
$\angle \text{AOC and}\angle \text{BOD}$
$\angle \text{AOD and}\angle \text{BOC}$

Hence above given angles are the vertically opposite angles.