Trigonometry
Basic

Cosine Ratio (CAH)

Ratio of the side adjacent to an angle to the hypotenuse.

Formula

cos⁡θ=adjacenthypotenuse\cos\theta = \frac{\text{adjacent}}{\text{hypotenuse}}

Variables

\thetaAngle

Example

cos 60° = 0.5

Did You Know?

Cosine is literally the "complement's sine" — the sine of the angle that completes yours to 90°.

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