In a right angled triangle, the cosine of an angle is:

The length of the adjacent side

divided by the length of the hypotenuse.

The abbreviation is cos

**cos(θ) = adjacent / hypotenuse**

../geometry/images/triangle-q.js?mode=cos

The length of the adjacent side

divided by the length of the hypotenuse.

The abbreviation is cos

**cos(θ) = adjacent / hypotenuse**

../geometry/images/triangle-q.js?mode=cos

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