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 acuteangle 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!

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.

Recap 🧢 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

Continue to explore how to identify types of angles with flashcards and practice problems!You can also use the Quick Links menu to jump to the section you’d like to explore!

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.

acuteangle

If you're not a fan of flashcards, continue with the lesson to see more examples another way! Otherwise, skip to some practice questions!

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.

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.

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.

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.

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.

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.

Incredible work! If you’d like additional practice with identifying types of angles, take a moment to complete the quick practice below before closing out this lesson! ⚡

Practice: Types of Angles

Question 1 of 12:

What kind of angle is this?$60_{∘}$

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.

When you feel like you've mastered this lesson, click for a celebration ⬇️!

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