If you form the digits with a seven-segment LED display,
then all of the digits except '1' have perpendicular lines.
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Perpendicular lines are lines that cross each other at 90 degree angles.For example, the letter T.The lines in the letter V are not perpendicular because the angle between them is less than 90 degrees.
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.
Any polygonal shape, other than a triangle can have perpendicular lines.
They are simply four pairs of perpendicular lines. There is nothing in the question to suggest there is anything more than that to them.
If they measure 90 degrees then they are perpendicular. Other than that they are just intersecting lines