Perpendicular lines intersect each other at right angles.
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Perpendicular lines intersect to form right angles
They are called perpendicular lines that intersect each other at right angles.
Two lines that intersect to form right angles are perpendicular.
If two lines (which extend infinitely in each direction) lie on the same plane but never intersect, then the lines are parallel. If the lines somewhere intersect, they are not. And if they intersect at right angles, they are orthogonal, or perpendicular.
They are perpendicular lines