Basic Trigonometry Facts
Algebra: Trigonometry Help
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360 degrees = 2p radians
so, 180 degrees = p radians
The original angle can be found by using the inverse trig function. For example:
Sometimes in the literature, arcsin is written
as sin-1 and so on to indicate that it is an inverse function.
In the following examples, the side lengths are found using the Pythagorean theorem.
sin 45o = cos 45o = 1/1.4142 =
0.7071
tan 45o = cot 45o = 1/1 = 1
sin 30o = cos 60o = 1/2 =
0.5
cos 30o = sin 60o = 1.7321/2 =
0.8661
tan 30o = cot 60o = 1/1.7321 =
0.5774
cot 30o = tan 60o = 1.7321/1 =
1.7321
Then, there are the special cases of 0 and 90o.
Angle | sin | cos | tan |
---|---|---|---|
0 | 0 | 1 | 0 |
90 | 1 | 0 | Infinity |
The sin and cos for the full circle (0 to 360o) are spelled out in the quadrant trigonometry facts help page.

Algebra: Trigonometry Help
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