Mathematics
Cosine Ratio
Define cosine of an acute angle in a right triangle.
cos θ = Adjacent / Hypotenuse
Formula Explanation
Cosine is the ratio of the adjacent side to the hypotenuse.
Variables Explained
θ = acute angle; Adjacent = side next to θ; Hypotenuse = longest side.
Solved Example
Adjacent = 4, Hypotenuse = 5. cos θ?
4/5 = 0.8.