Straight Angle

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Lesson Objective

In this lesson, we will learn about straight angle.

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About This Lesson

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.

a straight angle

Study Tips

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Tip #1

If an angle is exactly 180°, it is a straight angle. The picture below shows some examples:

examples on straight angles

Math Video

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Lesson Video

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Math Video Transcript

In this lesson, we will learn about this type of angle.

Let's take a look at this angle.

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

What happens, when the angle becomes 180 degrees?

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

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

Let's see some examples.

Is this a str. angle?

Yes! It is.

How about this angle?

Again, this is a str. angle.

Next example, is this a str. angle?

Clearly, this angle is not equals to 180 degrees.

Hence, this is not a str. angle

That is all for this lesson.

Practice Questions & More

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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.

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