QUICK LINKS


Introduction

QUICK LINKS


Introduction

INTRO
An angle is a figure formed by two lines or rays connecting at a common point called a vertex.
We identify angles based on the amount of space there is between the two lines. We measure this space in degrees (°) or radians - we'll be using degrees in this lesson.
There are six different types of angles based on size. To keep track of them, we imagine angles as stick figures in motion.
Pick an angle:
An acute angle is an angle that measures less than 90°. We can imagine the angle leaning forward to see something cute.
😅 We had trouble drawing a stick figure that...bends this way. If you have any ideas, send us sketches at support@almostfun.org!
Check out our
Calculator
or explore our
Lesson
and
Practice
sections to learn more about the different types of angles and test your understanding.

You can also use the Quick Links menu on the left to jump to a section of your choice.

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CALCULATOR

Identifying Angles Calculator

Step 1. Describe the angle.

What do you know about the angle? Check at least one box ✅
Looks like...The angle is...

Step 2. Identify your angle.

KEY STEPS

How to Identify Angles

Step 1. Describe the angle

Step 2. Identify the angle

The angle is:
  • leaning forward to see something cute
  • less than 90°
acute angle
The angle is:
  • sitting upright
  • equal to 90°
right angle
The angle is:
  • leaning backward to work its abs
  • greater than 90° and less than 180°
obtuse angle
The angle is:
  • lying flat and straight
  • equal to 180°
straight angle
The angle is:
  • flexing and bending past a straight line
  • greater than 180° and less than 360°
reflex angle
The angle is:
  • rotated all the way around
  • equal to 360°
full rotation angle
LESSON
Identifying Types of Angles

Identifying Types of Angles

There are six different types of angles based on size, or the space between the two lines. Use the following flashcards to strengthen your memory of the different angle types.

An angle that is less than 90° and looks like it's leaning forward to see something cute.
acute angle
✨ Click to flip! ✨
If you're not a fan of flashcards, continue with the lesson to see more examples another way!

EXAMPLE 1

Let's start by identifying this angle:

Step 1. Describe the angle.

Our angle looks like it's leaning forward to see something cute.

Step 2. Identify your angle.

EXAMPLE 2

Nice! Next, let's identify this angle:

Step 1. Describe the angle.

Our angle looks like it's sitting upright.

Step 2. Identify your angle.

EXAMPLE 3

Sweet! Next up, what type of angle is this?

Step 1. Describe the angle.

Our angle looks like it's leaning backward to work its abs.

Step 2. Identify your angle.

EXAMPLE 4

Great work! Up next, what type of angle is this?

Step 1. Describe the angle.

Our angle looks like it's lying flat and straight.

Step 2. Identify your angle.

EXAMPLE 5

Excellent! Now, a slightly funkier angle:

Step 1. Describe the angle.

Our angle looks like it's flexing and bending past a straight line.

Step 2. Identify your angle.

EXAMPLE 6

Amazing! And finally, what type of angle is this?

Step 1. Describe the angle.

Our angle looks like it's rotated all the way around.

Step 2. Identify your angle.

Awesome! If you’d like to practice additional problems with types of angles, expand the
Practice
below before closing out this lesson! ⚡
PRACTICE
Identifying Types of Angles

Practice: Identifying Types of Angles

Question 1 of 12:
What kind of angle is this?

Step 1. Describe the angle

The angle is...(check one box from each column)
Nice work! The angle is leaning forward to see something cute and is less than 90°. Now we're ready to classify our angle.

Step 2. Identify the angle

If the angle is leaning forward to see something cute and is less than 90°, it is a(n) angle.
Nice work! The angle is an acute angle.

CONCLUSION
Incredible job, look at you go! Thanks for checking out this lesson ☺️🙏. Where to next?
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