Perpendicular lines cross each other at right angles
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"perpendicular"
Two perpendicular lines must cross at a 90 degree angle, like a plus sign: +
Perpendicular
If two lines are perpendicular, they intersect at a right angle. So yes, they will always cross each other.
"Perpendicular" describes the relationship between two lines. A single line can't be 'perpendicular'.Two lines are perpendicular if1). they cross each other2). at the place where they cross, they form 90-degree angles