Types of Angles - Lessons

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Introduction

This page contains the list of lessons on types of angles. It also covers the basics on angles. Each lesson consists of a math video, study tips and practice questions.

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Lesson Description

An angle is formed when two lines diverge from a common point (the vertex). If you are new to angles, you can:

  • Learn about the basics on angles by watching the math video below.

After understanding the basics, the list of lessons below will touch on:

  • Using the protractor to measure angles.
  • Different types of angles.
angle basics
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Introduction Video

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Math Video Transcript

00:00:04.020
In this lesson, we will learn about the basics on angles.

00:00:09.040
Consider these 2 lines. When these 2 lines meet, an angle is formed.

00:00:17.100
This is the vertex of the angle and these 2 lines are the arms of the angle.

00:00:27.100
Now, this angle has a certain value.

00:00:31.030
This value happens to be 50 degrees.

00:00:35.150
Now, this symbol is the unit for angle. It is called 'degree'.

00:00:42.070
Knowing this, let's rotate this arm, to find out the different values of this angle.

00:00:49.060
Here, we can see that, the lowest value for this angle is 0 degree.

00:00:55.080
Next, let's increase the angle.

00:01:01.110
At this point, we have the angle as 90 degrees.

00:01:06.140
Let's further increase the angle. Now, we have 180 degrees, 270 degrees, finally 360 degrees for a full rotation.

00:01:36.220
Next, let's learn how to name an angle.

00:01:41.190
We can label these 3 vertex as A, B and C respectively.

00:01:52.150
Here, we can see that, this angle is between, A, B, and C.

00:02:04.070
With this, we can write, angle ABC equals to, 60 degrees.

00:02:12.070
Now, if we name it as, angle CBA, it is still the same.

00:02:20.170
Here, note that, the vertex of the angle is always the middle letter.

00:02:27.040
Therefore, we can also write the angle B, equals to 60 degrees provided that, it is not ambiguous.

00:02:37.170
That is all for this lesson.

--End of transcript for types of angles--

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