Perpendicular lines form right angles when they intersect.
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perpendicular lines
By definition, any lines/segments that are perpendicular to each other either do, or (in the case of non-intersecting segments) would, intersect each other at right angles. A right angle being a 90* angle. Therefore, perpendicular, intersecting line segments will form 4 90* angles.
...must be coplanar.
Perpindickular
Right angles are formed by perpendicular lines. If the lines would extend, to make two intersecting lines.