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28 May, 21:19

A firefighter places a 29 feet ladder, so that the base of the ladder is 21 feet from the wall. What is the height at which the top of the ladder touches the wall?

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  1. 28 May, 21:45
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    Pythagorean theorem:

    a^2+b^2=c^2 (C^2 always is the hypotenuse)

    21^2+b^2=29^2

    441+b^2=841

    841-441=400

    square root of 400 is 20

    Your answer is 20
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