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.
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Yes, parallel is not limited to straight lines. So the colored arcs of a rainbow may be considered to be parallel.
A trapezium is a quadrilateral with two parallel lines.
parallel lines are used in the white house. The columns holding it up are parallel lines and the floor and the roof of a room are parallel planes as long as they are the same shape
rhombus
Right angle triangle, yup that's right
hectagon