Nearly! The cosine is the adjacent side (ie not the opposite side) divided by the hypotenuse.
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Sine= Opposite/ Hypotenuse Cosine= Adjacent/ Hypotenuse
cosine
hypotenuse.
In a specific angle for a right triangle the cosine ratio is the ratio between the lengths of the adjacent side (side touching the angle) and the hypotenuse (longest side).
Use trigonometry and the cosine ratio: cos = adj/hyp and when rearraged hyp = adj/cos