Elias completely covered a square canvas using 77.8 in. of fabric without any overlap. Which measurement is closest to the side length of this canvas in inches?
8 in.
9 in.
19 in.
39 in.

21 is the answer the answer is 21

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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.