If they make right angles they are perpendicular. If they do not make a right angle, they are intersecting.
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Perpendicular lines are a specific kind of intersecting lines. Intersecting lines are any two lines that cross through each other. Depending on how they cross each other, they may make angles from 170 degrees to 1 degree. Perpendicular lines are specifically two straight lines that cross each other at right angles, so that they create angles that are 90 degrees.
lines that are beside each other and never meet
Either they are parallel to or they intersect each other.
Angles are formed when two lines intersect (depends on the way the lines intersect to determine what kind of angles they are). Since parallel lines do not intersect each other at all, there is no angle between them.
Any polygonal shape, other than a triangle can have perpendicular lines.