A line that makes a right angle
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A perpendicular line is two lines that look like a plus +. If they're not perpendicular, they don't cross with 90 degree angles.
That is impossible because it can only have 1 perpendicular line so if it has 2 it wouldn't be a triangle.
A line which forms a right angle with another line (think an upside-down T) Actually it doesn't have to be upside-down...
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.