Janie's pool is 50 feet long, 20 feet wide, and 6 feet deep. Each cubic foot holds 7.5 gallons of water. How many gallons of water will it take to fill up the pool?

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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.