### Obtuse Angles #### Lesson Objective

In this lesson, we will learn about obtuse angles. After knowing what are acute angle and right angle, we will now learn:

• What are obtuse angles.
• See some examples on identifying them.

The study tips below will give you a short summary on this.

The math video below will explain in depth about this. Furthermore, it will show some examples so that you can understand this lesson better. ### 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 #### Math Video Transcript

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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.

00:01:05.050
Also, it is always lesser than 180 degrees. This is also true, for this angle.

00:01:13.230
So, it is clear that, this is an obt. angle.

00:01:19.120

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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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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. #### Site-Search and Q&A Library

Please feel free to visit the Q&A Library. You can read the Q&As listed in any of the available categories such as Algebra, Graphs, Exponents and more. Also, you can submit math question, share or give comments there. 