### Acute Angles & Right Angle

#### Lesson Objective

In this lesson, we will learn what are acute angles and right angle.

#### About This Lesson

In this lesson, we will learn:

- What are acute angles.
- What is a right angle.
- See some examples on identifying them.

There are many types of angles. As a start, we will learn about these two types of angles. We will proceed to the other types of angles after completing this lesson.

The study tips and math video below will explain more.

### Study Tips

#### Tip #1

If an angle is greater than 0° and lesser than 90°, it is called an acute angle. Below are some examples:

#### Tip #2

Right angle is exactly equals to 90°.

The math videos below will explain more on this.

### Math Video

#### Math Video Transcript

00:00:03.120

In this lesson, we will learn about acute angles.

00:00:08.100

Let's take a look at this angle.

00:00:11.140

Now, since this angle, is somewhere in between 0 degrees and 90 degrees, it is an angle.

00:00:19.140

Hence, we can say that an acu. angle, is always greater than 0 degrees, and lesser than 90 degrees.

00:00:29.010

Let's see some examples to understand this better.

00:00:33.130

Consider this angle of 80 degrees. Is this an acu. angle? Yes! it is.

00:00:45.120

How about this angle, of 35 degrees? Yes! It is an acu. angle.

00:00:54.140

Alright, take a close look at this angle. Is this an acu. angle?

00:01:02.080

We know that, an acu. angle, is always greater than 0 degrees. This is true, for this angle.

00:01:11.020

Also, it is always lesser than 90 degrees. Again, this is also true, for this angle.

00:01:21.130

Yes, it is.

00:01:26.230

Next, how about this angle?

00:01:31.080

Clearly, this angle is greater than 90 degrees.

00:01:35.200

Hence, it is not.

00:01:39.230

That is all for this lesson.

#### Math Video Transcript

00:00:04.020

In this lesson, we will learn about right angle.

00:00:08.080

By now, we should know that, acu. angles must be in between 0 degrees, and 90 degrees.

00:00:16.020

So, what happens if the angle is 90 degrees?

00:00:21.050

When the angle is 90 degrees, it will be called, right angle.

00:00:26.130

Now, this angle is quite special. It has its own square symbol, to represent it.

00:00:34.190

To emphasize again, the right angle simply means that, the angle is 90 degrees.

00:00:42.210

Now, let's see some examples on this.

00:00:46.240

Is this a right angle? Yes! It is.

00:00:55.180

How about this? Yes again.

00:01:03.120

Next, is this a right angle? No, it is not.

00:01:12.030

That is all for this lesson. Try out the practice question to further your understanding.

### 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 acute angles and right angle or pick your choice of question below.

- Question 1 on identifying acute angles.
- Question 1 on identifying right angles.

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