Perpendicular Lines are a pair of lines that always intersect each other at right angles . Learn the properties, formula and examples of Perpendicular Lines in this article. Learn about parallel and perpendicular lines . Get their definitions, properties, and examples in everyday life. Perpendicular lines are two lines that intersect each other at an angle of 90°. We can also say that, if two lines are perpendicular , their intersection forms a right angle. Here, we will learn more details of the perpendicular lines . We will learn about its properties and solve some exercises.