How to change a percent into a decimal number?

On the percent, you move the given decimal (behind the numbers given) two places to the left, for example, 90%= .90

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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.