Identifying Perpendicular Lines: 90-Degree Angle Analysis

Video Solution

Solution Steps

00:03 Which of the lines are perpendicular?

00:07 Remember! Perpendicular lines meet to form a right angle, which is 90 degrees.

00:14 In this example, the lines create an angle that's greater than 90 degrees.

00:31 Here, the lines create an angle that's less than 90 degrees.

00:38 In this example, the lines meet at a perfect right angle, exactly 90 degrees!

00:47 Once again, the lines make an angle greater than 90 degrees.

00:52 And that's how we find the perpendicular lines. Great job!

Step-by-Step Solution

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

In each of the answers, we will draw the letter T at the intersection point of the lines.

Let's examine figure A:

We notice that the lines do not form a right angle and therefore are not perpendicular.

Let's examine figure B:

We notice that the lines do not form a right angle and therefore are not perpendicular.

Let's examine figure C:

We notice that the lines do not form a right angle and therefore are not perpendicular.

Let's examine figure D:

We notice that the lines do form a right angle therefore are perpendicular lines.