Identifying Perpendicular Lines: 90-Degree Angle Recognition

Video Solution

Solution Steps

00:00 Which of the lines are perpendicular?

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

00:08 In this example, the lines form an angle less than 90°

00:11 In this example, the lines form a right angle

00:16 In this example, the lines form an angle less than 90°

00:22 In this example, the lines form an angle less than 90°

00:26 And this is the solution to the question

Step-by-Step Solution

Let's remember that perpendicular lines form a 90-degree angle between them.

To check if the lines form a 90-degree angle, for each of the drawings a T is drawn at the intersecting point of the lines.

Let's examine figure A:

Note that the lines do not form a right angle.

Let's examine figure B:

We notice that the lines form a 90-degree angle and therefore are perpendicular.

Let's examine figure C:

Note that the lines do not form a right angle.

Let's examine figure D:

Note that the lines do not form a right angle.