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25-12-2017
Mathematics

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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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1isytem 1isytem

25-12-2017

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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