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.
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Perpendicular lines intersect at 90 degrees.
whatto line segments intersect but are not perpendicular
Perpendicular lines intersect at right angles to each other.
Perpendicular lines intersect to form right angles.
If two lines intersect at right angles then they are perpendicular!