Obtuse Angles

Lesson Icon

Lesson Objective

In this lesson, we will learn about obtuse angles.

Why icon

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.

an obtuse angle

Study Tips

Study Tips Icon

Tip #1

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

examples on obtuse angles

The math video below will explain more on this.

Math Video

Lesson Icon

Lesson Video

Sponsored Links

Lesson Icon

Math Video Transcript

In this lesson, we will learn about obtuse angles.

Let's take a look at this angle.

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

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

Let's see some examples on this.

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

Yes! It is.

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

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

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

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

Next, how about this angle?

Clearly, this angle is less than 90 degrees.

Hence, it is not an obt. angle.

How about this angle?

Now, this angle is more than 180 degrees.

Hence, this is not an obt. angle.

That is all for this lesson.

Practice Questions & More

Practice Icon

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.

Search Icon

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.

Practice Icon

Share This Page