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Six Trigonometric Functions and Radians

Degrees versus radians and calculator modes.

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Radian Measure

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You probably are familiar with degrees in trig, but did you know there is another way to measure angles?

These are called Radians and unlike Degrees, do not have a unit.

Why don't radians have a unit? How are they derived? Look here for guidence

Converting Between Radians and Degrees 


To go from degrees to Radians multiply your degrees by 

To go from Radians to degrees multiply your radians by 

Tips and Tricks: Since we know that , you can visualize  radians as being half a circle. Using this trick, fill out the table below.

Radians Degrees

Note: In upper level math Radians are prefered over degrees because they are unitless, so you should get used to Radians!

For extra practice, try these practice problems here.

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