Right Angles and Perpendicular Lines

Recall that a right angle measures exactly 90°. The sides of a right angle are said to be perpendicular to one another.

If two intersecting lines or segments form 90° angles around the point of intersection, they are called perpendicular lines.

The perpendicular relationship between two lines or segments is denoted by the symbol " ". For example, means that and are perpendicular to one another.