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11.02 Angles and angle types

Lesson

Are you ready?

Being able to identify an angle can help us in this lesson. Let's try this problem to review. 

Which of the following is a right angle?

  1. A

    B

    A

    B

Learn

This video explains about acute, right, obtuse, straight, and reflex angles, as well as revolutions.

Apply

Select the obtuse angle:

  1. A

    B

    C

    D

    A

    B

    C

    D

Remember

A full revolution is made up of $360$360 degrees, a single degree is written $1^\circ$1°.

Angle type Angle size
Acute angle Larger than $0^\circ$0°, smaller than $90^\circ$90°.
Right angle $90^\circ$90°
Obtuse angle Larger than $90^\circ$90°, smaller than $180^\circ$180°.
Straight angle $180^\circ$180°
Reflex angle Larger than $180^\circ$180°, smaller than $360^\circ$360°.
Full revolution $360^\circ$360°

 

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