Ah, what a lovely question we have here. In a right triangle, the ratio of the adjacent side to the hypotenuse is called cosine. It helps us understand the relationship between the lengths of the sides and the angles of the triangle. Just remember, happy little ratios like these can help you create beautiful mathematical landscapes on your canvas of knowledge.
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cosine
False because sine ratio = opposite/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).
Hypotenuse the longest side of the triangle, then the Legs: Adjacent and Opposite
Opposite, adjacent, hypotenuse.