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Circles and PiRadians Trig

Trigonometry

For most simple geometry problems, degrees and radians are completely interchangeable – you can either pick which one you prefer, or a question might tell you which unit to give your answer in. However, once you study more advanced trigonometry or calculus, it turns out that radians are much more convenient than degrees.

Most calculators have a special button to switch between degrees and radians. Trigonometric functions like sin, cos and tan take angles as input, and their inverse functions arcsin, arccos and arctan return angles as output. The current calculator setting determines which units are used for these angles.

Try using this calculator to calculate that

sin(30°) = cos(1°) =
sin(30 rad) = cos(1 rad) =

DEG
7
8
9
sin
4
5
6
cos
1
2
3
tan
0
.
C
mode
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