Perpendicular lines are two lines that intersect to form four right angles.
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They could be: parallel lines, perpendicular lines or intersecting lines
Perpendicular means that two lines intersect like an X but its just perpendicular
parellel lines mean they are to lines the same
Two lines that intersect and form 90-degree angles (right angles) are "perpendicular" to each other. You would call them "perpendicular lines."
These lines are perpendicular: _|