Which set of numbers can represent the side lengths, in inches, of an acute triangle?
4,5,7
5.7.8
6.7.10
7,9,12

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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.

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