Cosine
Also: cos
A trigonometric ratio connecting an angle to the adjacent side of a right triangle.
For angle θ, cos θ = adjacent/hypotenuse and is the x-coordinate on the unit circle.
- Formula
cos θ = adjacent/hypotenuse
Example A 250 mm link at 30° reaches about 217 mm horizontally.
Common misconception Cosine and sine are not interchangeable; their sides depend on the declared angle.