The results of the woodlands middle school poll show that 20% of the students prefer to got o the aquarium and 50% of the teachers prefer to the aquarium

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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.