They are perpendicular lines that meet at right angles which is 90 degrees.
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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.
a right angle
If they make right angles they are perpendicular. If they do not make a right angle, they are intersecting.
Only three types of angles can be formed by two intesecting lines. Obtuse, acute, and right.