perpendicular
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A 90 degree angle is formed at a right angle.
complimentary
They are perpendicular.Perpendicular
perpendicular lines
A pair of parallel lines never meet, however perpendicular lines meet at a 90 degree angle. Your question isn't all that clear tho.... meaning they are opposite because parallels never meet and perpendiculars do.Parallel lines are lines that never intersect, no matter how far they extend in either direction. Perpendicular lines intersect perfectly straight, at a 90 degree angle.