Cosine of 30 degrees..........0.866



Now we know the lengths, we can calculate the functions:

Sine		sin(30°) = 1 / 2 = 0.5
Cosine		cos(30°) = 1.732 / 2 = 0.866...
Tangent		tan(30°) = 1 / 1.732 = 0.577...

(get your calculator out and check them!)

Example: what are the sine, cosine and tangent of 45° ?

The classic 45° triangle has two sides of 1 and a hypotenuse of √2:

Sine		sin(45°) = 1 / 1.414 = 0.707...
Cosine		cos(45°) = 1 / 1.414 = 0.707...
Tangent		tan(45°) = 1 / 1 = 1