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the adjacent side over the hypotenuse
That's the cosine of the angle to which the 'adjacent' side is adjacent.
Adjacent side over the hypotenuse.
The ratio of the length of the side opposite a given angle to the hypotenuse is the sine of that angle.The ratio of the length of the side adjacent to a given angle to the hypotenuse is the cosine of that angle.The ratio of the length of the side opposite a given angle to the side adjacent to that angle is the tangent of that angle.
It is the ratio of the length of the adjacent side to that of the hypotenuse.