### Straight Angle #### Lesson Objective

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

• What is a straight angle.
• See some examples on identifying it.

The study tips below will give you a short summary and it can be used to recall the properties of this angle.

The math video below will explain more in depth about this angle. Furthermore, it will show some examples to identify this angle so that you can understand this lesson better. ### Study Tips #### Tip #1

If an angle is exactly 180°, it is a straight angle. The picture below shows some examples: ### Math Video #### Lesson Video You can contribute to the development of this site and keep it free by getting all six video lessons and volume of solids and calculator app for just US\$1.99 from Apple App Store.

I'd like to contribute or to know more about the app #### Math Video Transcript

00:00:03.200

00:00:08.120
Let's take a look at this angle.

00:00:11.200
In the previous lesson, we learned that an obtuse angle is always more than 90 degrees, and less than 180 degrees.

00:00:20.210
What happens, when the angle becomes 180 degrees?

00:00:26.140
When the angle becomes 180 degrees, it is called a str. angle.

00:00:32.230
To emphasize, str. angle is an angle that is equals to 180 degrees.

00:00:40.090
Let's see some examples.

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Is this a str. angle?

00:00:48.030
Yes! It is.

00:00:51.210

00:00:55.140
Again, this is a str. angle.

00:00:59.240
Next example, is this a str. angle?

00:01:05.030
Clearly, this angle is not equals to 180 degrees.

00:01:10.160
Hence, this is not a str. angle

00:01:15.220
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 straight angle or pick your choice of question below. #### Site-Search and Q&A Library

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