Perpendicular lines are two distinct lines that intersect each other at a right angle, which is exactly 90 degrees. This means that when the two lines meet, they form four right angles at the point of intersection

. Key points about perpendicular lines:

• They always intersect at a 90° angle, also known as a right angle

• The symbol used to denote perpendicularity between two lines is ⊥\perp ⊥

• Not all intersecting lines are perpendicular; only those that meet at 90° qualify

• Perpendicularity is symmetric: if line A is perpendicular to line B, then line B is perpendicular to line A

• Perpendicular lines are different from parallel lines, which never intersect and remain the same distance apart

Examples of perpendicular lines include the corner edges of walls, the letter "L", or the intersection of the North-South and East-West directions on a compass

. In summary, perpendicular lines are defined by their intersection at a right angle (90°), making them a fundamental concept in geometry and everyday structures