Answer: 1 set
Explanation:
1 set=2 lines
-A trapezoid has 4 lines: top, bottom, left, and right.
The top and bottom lines is a set of parallel lines because they will never cross each other.
Now, we are left with the left and right sides. They are slanted and are not 90 degree angles, so that means that they will eventually meet if you keep drawing their lines.
This means that the left and right sides are perpendicular. Also, since 2 sides=1 set, we have 1 set of perpendicular lines.
Hope this helps!