In a right triangle, which of the following represents the cosine of angle θ as a ratio?

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Multiple Choice

In a right triangle, which of the following represents the cosine of angle θ as a ratio?

Explanation:
Cosine of an angle in a right triangle is the ratio of the length of the leg that is adjacent to the angle to the length of the hypotenuse. In other words, cosine equals the adjacent side divided by the hypotenuse. This matches the needed ratio. The opposite-to-hypotenuse ratio is sine, the opposite-to-adjacent ratio is tangent, and the hypotenuse-to-adjacent ratio is the reciprocal of cosine (secant). So the correct representation is the adjacent side over the hypotenuse.

Cosine of an angle in a right triangle is the ratio of the length of the leg that is adjacent to the angle to the length of the hypotenuse. In other words, cosine equals the adjacent side divided by the hypotenuse. This matches the needed ratio. The opposite-to-hypotenuse ratio is sine, the opposite-to-adjacent ratio is tangent, and the hypotenuse-to-adjacent ratio is the reciprocal of cosine (secant). So the correct representation is the adjacent side over the hypotenuse.

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