Four.
No, parallel lines are straight lines.
Strictly speaking, the answer is no. There is an implicit assumption that parallel lines refer to straight lines and, since there are no straight lines in a rainbow, there cannot be any parallel lines. The lines are concentric and so they never meet.
The Equator divides the Earth into the Northern Hemisphere and the Southern Hemisphere. Lines of latitude are parallel to the Equator both to the north and to the south.
Parallel
A shape with 4 straight lines in which there are 2 parallel and 2 unparallel lines is called a Trapezium.
Straight lines that never cross are called parallel lines.
Parallel lines are straight lines which are oriented the same way. For example, two railway lines are parallel to each other.
Parallel lines
Two straight lines that remain equal distance apart are parallel lines.
straight angles
parallel
Perpendicular lines Parallel lines Diagonal lines