Types of Angles
In geometry, there are three types of angles:
- acute angle-an angle between 0 and 90 degrees
- right angle-an 90 degree angle
- obtuse angle-an angle between 90 and 180 degrees
- straight angle-a 180 degree angle
Here are a few examples of angles:

Now you are ready to explore angles on your own.
Sketchpad Activity
Return to the Prerequisites Menu