Types of Angles



Types of angles are discussed here in this lesson. We will learn different types of angles.



1. Acute Angle:

An angle whose measure is less than 90° is called an acute angle.



∠MON shown in adjoining figure is equal to 60°. So, ∠MON is an acute angle.



2. Right Angle:

An angle whose measure is 90° is called right angle.



∠AOB shown in adjoining figure is 90°.

So, ∠AOB is a right angle.



3. Obtuse Angle:

An angle whose measure is greater than 90° but less than 180° is called an obtuse angle.



∠DOQ shown in adjoining figure is an obtuse angle.



4. Straight Angle:

An angle whose measure is 180° is called a straight angle.



∠XOY shown in adjoining figure is a straight angle.

A straight angle is equal to two right angles.



5. Reflex Angle:

An angle whose measure is more than 180° but less than 360° is called a reflex angle.



∠AOB shown in adjoining figure is 210°.

So, ∠AOB is a reflex angle.



6. Zero Angle:

An angle measure 0° is called a zero angle.


When two arms of an angle lie on each other, angle is formed.

Related Links :



Angle.

  • Interior and Exterior of an Angle.
  • Measuring an Angle by a Protractor.
  • Types of Angles.
  • Pairs of Angles.
  • Bisecting an angle.
  • Construction of Angles by using Compass.
  • Worksheet on Angles.
  • Geometry Practice Test on angles.




  • 5th Grade Geometry

    5th Grade Math Problems

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