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24 February, 00:40

A 20 ft ladder reaches a window 18 ft high. How far is the foot of the ladder from the base of the building?

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  1. 24 February, 01:08
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    Pythagoran theorem

    length of ladder=hyptonuse

    height of window is one leg

    distance base is fram building is other leg

    a²+b²=c²

    c=hyp

    a and b are legs

    18²+b²=20²

    324+b²=400

    b²=76

    b=2√19ft or aprox8.7178ft
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