In the given set of lines, line ___ is a transversal.
PQ
A line that intersects two or more lines is called a transversal. Here, line PQ intersects the lines AB, CD, EF and GH. Therefore, in the given set of lines, PQ is the transversal.
In cases when the transversal intersects some parallel lines at 90∘, we call it a perpendicular transversal.