Identifying Perpendicular Lines: Finding 90-Degree Intersections

Which lines are perpendicular to each other?

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00:03 Are any of these lines perpendicular?
00:06 Perpendicular lines meet to form a right angle, exactly ninety degrees.
00:12 In this example, the angle is less than ninety degrees, so they are not perpendicular.
00:26 And here, the lines don't meet at all, also not perpendicular.
00:30 And that's how you know which lines are perpendicular!

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1

Understand the problem

Which lines are perpendicular to each other?

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Step-by-step solution

Let's remember that perpendicular lines are lines that form an angle of 90 degrees between them.

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

Let's examine figure A:

We notice that the lines do form a right angle and the lines are perpendicular to each other.

Let's examine figure B:

We notice that the lines do not meet and do not form any angle; therefore, they are parallel lines and not perpendicular.

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What do the four figures below have in common?

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