"Perpendicular" means at an angle of 90° to a given line, plane, or surface.
If they intersect at right angles which is 90 degrees then they are perpendicular lines.
The plumb line is a vertical straight line.
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like a straight line, I believe
"Perpendicular" means at an angle of 90° to a given line, plane, or surface.
If they intersect at right angles which is 90 degrees then they are perpendicular lines.
opposite
a straight line
A curved line is a line that is curved.
A linear line is a straight line
a line across
If the line has ends, then it's a line segment.
The plumb line is a vertical straight line.
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a line