Identify Perpendicular Lines: Finding 90° Intersections Among Lines 1-4

Question

Which lines are perpendicular to each other?

00:00 Which lines are perpendicular?

00:03 Perpendicular lines create a right angle at their intersection point

00:06 In this example, the lines create a right angle

00:09 In this one too

00:16 And in this one

00:24 In this example, the lines create an angle greater than 90

00:32 And this is the solution to the question

Let's remember that perpendicular lines are vertical lines that create a 90-degree angle with each other.

To examine the types of angles that lines create with each other, let's draw a T at the intersection point of the lines in the following way:

Note that in drawings 1+4 we see right angles, meaning the lines are perpendicular to each other.

In the other drawings, the angles created are greater or smaller than 90 degrees, therefore the lines are not perpendicular.

1 and 4