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!
Intersecting, perpendicular.
90 degrees
The diagonals of a square are always perpendicular.
No, not necessarily. It would have to also be a square or a kite in order to have perpendicular diagonals.