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7. Vertically Opposite Angles: When two lines intersect each other at a point,
then vertically opposite angles formed.
Two lines AB and CD intersect each other at point O, then, there are two pairs of
vertically opposite angles.
One pair is ∠AOD and ∠BOC and another pair is ∠AOC and ∠BOD.
8. Intersecting Lines and Non-intersecting Lines
Intersecting Lines
If two lines intersect at a point, then they are called intersecting lines.
