They are straight lines that intersect each other at right angles or 90 degrees.
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Perpendicular is mostly used to describe Shapes and their properties. It means when two lines meet up at a 90 degrees right angle. It might be an X or a T when you look at it. Like the example shown below:------------------------------------lllllSo that isn't a good drawing, but it does show you the meaning of perpendicular!
90 degrees
Intersecting, perpendicular.
The diagonals of a square are always perpendicular.
You could draw in the two diagonals (from corner to opposite corner). You could draw two perpendicular lines to develop four squares inside the existing square. You could draw three parallel lines to develop four equally-sized rectangles within the square.