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If the arc length AB is equal to the length OA or OB (radius), then the measure

of angle AOB (∠AOB) is called 1 radian.

So that you understand more about angle measurement, let's watch the following

video:

Example 1
Express the following angles in radians.

°
a. 60
°
b. 150
°
c. −120
Answer :

°
a. 60 = 60 x = 60 x radians = radians = radians = radians1 ° 60 1
180 180 30 3
6