The sides on a ladder are perpindicular from each other.
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Something which is perpendicular is at right angles an example would be that a tree growing straight out of the ground would be perpendicular to the ground. Things are parallel when they run along side each other always the same distance apart, an example would be railway tracks.
perpendicular means 'at 90 degrees to' for example a 'T'
Perpendicular means "at right angles to". L is an example of two lines that are perpendicular to one another.
When lines cross at 90 degrees, they are perpendicular. Anything less than 90 degrees, or anything more than 90 degrees, is not perpendicular. An example of a perpendicular intersection would be a plus sign + . An example of a non-perpendicular intersection is the letter X . Hope this helps.
Just one example: If you want to build something like a cabinet, you would want the sides to be perpendicular to each other, and to the top and bottom. Otherwise the door may not open and close correctly.