Types of Angles

Right Angle (Quarter-Turn) – Two rays that connect to form a square corner.
Straight Angle (Half Turn) – Two rays that connect to form a straight line.
Acute Angle – An angle with a measure less than a right angle (half turn)
Obtuse Angle – An angle with a measure greater than a right angle but less than a straight angle.
Reflex Angle – An angle with a measure greater than a straight angle.
Note that an acute or obtuse also has a reflex angle on the outside of its arms.

The following figures show the different types of angles: Right angle, Straight angle, Acute angle, Obtuse angle and Reflex angle. Scroll down the page for more examples and solutions.

 

Introduction to Angles and Angle Types
Angles are used to measure the amount of turn.
This video shows you: How are angles formed? How do we classify angles? What are the different types of angles?
Types of Angles: Acute, Right, Obtuse, Straight, Reflex, & Complete

• Show Video

Classifying Angles
Identify acute, obtuse and right angles.

• Show Video

What is an angle is and how angles are measured?
It demonstrates the measuring of angles with a protractor.
It goes over different classifications of angles such as acute angles, right angles, obtuse angles, straight angles, reflex angles and full rotation angles.

• Show Video

Types of Angles
This video illustrates acute, right, obtuse, straight, reflex, and full angles.

Angles Music Video
A song about the types of angles and the degrees of the different types of angles.

• Show Video

Try out our new and fun Fraction Concoction Game.

Add and subtract fractions to make exciting fraction concoctions following a recipe. There are four levels of difficulty: Easy, medium, hard and insane. Practice the basics of fraction addition and subtraction or challenge yourself with the insane level.

We welcome your feedback, comments and questions about this site or page. Please submit your feedback or enquiries via our Feedback page.