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The arrangement of the spectral colors are determined by how the human eye and brain work. There is no clear reason to believe that different people or animals see the spectrum the same. In fact it is easy to show that they don't.
Lines that have the same slope are said to be parallel lines.
Lines which lie on the same plane and have the same length are known as symmetry lines
parellel lines
Parallel lines. they never intersect and lie on the same plane.parallel lines