Perpendicular lines are ones that make right angles when they meet. For instance the letters T H E and L are all made of perpendicular line segments.
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As far as we know, two lines can be perpendicular, or they can be parallel, but they can't be both.
These lines are perpendicular: _|
They look like two intersecting lines that make four right angles. Like the two lines in this L.
They are straight lines that intersect each other at 90 degrees
A perpendicular line is two lines that look like a plus +. If they're not perpendicular, they don't cross with 90 degree angles.