Yes, parallel and perpendicular are opposites.
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Perpendicular: No Parallel: Yes, two pairs.
I, the top and bottoms lines are parallel, but the vertical line is perpendicular to the top and bottom lines.
A square has both parallel and perpendicular symmetry. It is composed of two sets of parallel lines that meet at perpendicular angles.
No, oblique lines are neither parallel nor perpendicular
Railroad tracks or the number 11 are parallel lines. A cross or a small t are perpendicular lines. Also the two ll's in the middle of parallel are parallel lines.