Obtuse Angles

Lesson Objective

In this lesson, we will learn about obtuse angles.

Study Tips

Tip #1

If an angle is more than 90° and less than 180°, it is called an obtuse angle. Below are some examples:

The math video below will explain more on this.

Math Video

Lesson Video

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Math Video Transcript

00:00:03.120
In this lesson, we will learn about obtuse angles.

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Let's take a look at this angle.

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Now, when an angle is somewhere between 90 degrees and 180 degrees, it is called obt. angle.

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In other words, an obt. angle is always more than 90 degrees, and less than 180 degrees.

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Let's see some examples on this.

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Consider this angle of 150 degrees. Is this an obt. angle?

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Yes! It is.

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Next example, take a close look at this angle. Is this an obt. angle?

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We know that, an obt. angle is always more than 90 degrees. This is true, for this angle.

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Also, it is always lesser than 180 degrees. This is also true, for this angle.

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So, it is clear that, this is an obt. angle.

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Next, how about this angle?

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Clearly, this angle is less than 90 degrees.

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Hence, it is not an obt. angle.

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How about this angle?

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Now, this angle is more than 180 degrees.

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Hence, this is not an obt. angle.

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That is all for this lesson.

Practice Questions & More

Multiple Choice Questions (MCQ)

Now, let's try some MCQ questions to understand this lesson better.

You can start by going through the series of questions on obtuse angles or pick your choice of question below.

Question 1 on identifying this type of angle.

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