### Obtuse Angles

#### Lesson Objective

In this lesson, we will learn about obtuse angles.

#### About This Lesson

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

Sponsored Links

#### Math Video Transcript

00:00:03.120

In this lesson, we will learn about obtuse angles.

00:00:07.230

Let's take a look at this angle.

00:00:11.110

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

00:00:22.220

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

00:00:31.180

Let's see some examples on this.

00:00:35.130

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

00:00:43.050

Yes! It is.

00:00:47.020

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

00:00:56.000

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

Next, how about this angle?

00:01:23.130

Clearly, this angle is less than 90 degrees.

00:01:28.010

Hence, it is not an obt. angle.

00:01:33.000

How about this angle?

00:01:36.070

Now, this angle is more than 180 degrees.

00:01:40.240

Hence, this is not an obt. angle.

00:01:45.220

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.

#### 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.