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14 October, 13:21

Tom wants to reach a second floor window on a house that is 20 feet above ground. If he must put the ladder at a 70° angle to the ground, how long must the ladder be?

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  1. 14 October, 13:31
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    Let the ladder length be L, then

    sin 70 = 20/L, L = 20/sin70 = 21.3 feet

    the length of ladder is 21.3 feet
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