Types of Angles - Lessons
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.
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.
The Basics on Angles from MathExpression.com on Vimeo.
Get to know angles better in a fun interactive way by downloading our free Zapzapmath Home Grade 4 and playing Angle Align:
Apple App Store (iOS) | Google Play (Android)
Math Video Transcript
In this lesson, we will learn about the basics on angles.
Consider these 2 lines. When these 2 lines meet, an angle is formed.
This is the vertex of the angle and these 2 lines are the arms of the angle.
Now, this angle has a certain value.
This value happens to be 50 degrees.
Now, this symbol is the unit for angle. It is called 'degree'.
Knowing this, let's rotate this arm, to find out the different values of this angle.
Here, we can see that, the lowest value for this angle is 0 degree.
Next, let's increase the angle.
At this point, we have the angle as 90 degrees.
Let's further increase the angle. Now, we have 180 degrees, 270 degrees, finally 360 degrees for a full rotation.
Next, let's learn how to name an angle.
We can label these 3 vertex as A, B and C respectively.
Here, we can see that, this angle is between, A, B, and C.
With this, we can write, angle ABC equals to, 60 degrees.
Now, if we name it as, angle CBA, it is still the same.
Here, note that, the vertex of the angle is always the middle letter.
Therefore, we can also write the angle B, equals to 60 degrees provided that, it is not ambiguous.
That is all for this lesson.
--End of transcript for types of angles--
Using a Protractor (Measuring Angles)
In this lesson, we will learn how to measure angles using a protractor...
Acute Angles & Right Angle
In this lesson, we will learn what are acute angles and right angle...
In this lesson, we will learn about obtuse angles...
In this lesson, we will learn about straight angle...
In this lesson, we will learn about reflex angles...
In this lesson, we will learn that a 360 degree angle is a full angle...