Perpendicular lines are vertical lines that form a right angle between them, that is, an angle of $90°$ degrees.

Perpendicular lines appear in many geometric shapes, such as a rectangle, a square, a right triangle, and others.

Perpendicular lines are vertical lines that form a right angle between them, that is, an angle of $90°$ degrees.

Perpendicular lines appear in many geometric shapes, such as a rectangle, a square, a right triangle, and others.

Which lines are parallel to each other?

Perpendicular lines that form a $90°$ degree angle between them.

Perpendicular lines in a right triangle.

Perpendicular lines in a rectangle: the $2$ adjacent sides in the rectangle are perpendicular to each other.

Test your knowledge

Question 1

Which lines are perpendicular to each other?

Question 2

Which lines are perpendicular to each other?

Question 3

What lines intersect?