For a given parallel lines, the line that intersects them is known as a transversal. To make you understand better, I'm giving you this diagram.
In the given figure, line PS is the transversal.
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Moushami Nayak answered this
Adjacent angles are 2 angles that sit next to each other or we can say they are two angles that share a common arm for example the above figure given by Apoorva angleAQP is is adjacent to angle PQB and angle CRS is adjacent to angle SRD .
