A rate is a ratio that compares A
a part to a part
B
a part to a whole.
с
quantities with different units.
D
quantities with the same units.

C. Two quantities with different units

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since the cosine is the ratio of the adjacent side to the hypotenuse, you can see that cos 60° = ½. answer. according to the property of cofunctions (topic 3), sin 30° is equal to cos 60°. sin 30° = ½.