Identifying Straight Angles

Identifying Straight Angles
Coming up next: Angles of 90, 180, 270 & 360 Degrees

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  • 0:05 A Straight Angle
  • 0:21 Characteristics
  • 0:48 Identifying Straight Angles
  • 1:34 Example
  • 2:42 Lesson Summary
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Lesson Transcript
Instructor: Yuanxin (Amy) Yang Alcocer

Amy has a master's degree in secondary education and has taught math at a public charter high school.

After viewing this lesson, you should know what a straight angle looks like. You should also know what a straight angle does and how you can identify one.

A Straight Angle

In this lesson, we are going to talk about a special type of angle called the straight angle. A straight angle changes the direction you are pointing in. If you have an arrow pointing in one direction, you will end up pointing in the opposite direction if you follow a straight angle. This is what a straight angle looks like.

straight angle


As you can see, a straight angle looks an awful lot like a straight line. This is because a straight angle actually produces a straight line. This type of angle measures 180 degrees. 180 degrees is a straight line, and it turns you around. This is why you might hear someone say that they just did a complete 180 when they mean that they have changed their direction or mind so that they are going in the opposite direction or thought.

Identifying Straight Angles

When you come across math problems that involve straight angles, you may not be given a straight angle right away. You may have to search for one. Your straight angles may come in the form of two angles side by side. For example, you might have two 90 degree angles, or right angles, next to each other. When you have two right angles next to each other, you get 90 + 90 = 180 degrees, which gives you a straight angle. You can also see that the outermost arms of the two right angles combine to produce a straight line.

straight angle

Or you can have two or more angles that add up to 180 all next to each other. Whatever the case, as long as your angle measures 180 degrees, you will have a straight angle. Looking at it, it should look like a straight line.


Let's take a look at a possible problem.

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