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15 October, 00:00

A 100ft ladder rests on top of a hook and ladder truck with its base 11 feet from the ground. When the angel of elevation of the ladder is 81", how high up the building will the ladder reach?

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  1. 15 October, 03:30
    0
    99.39ft

    Step-by-step explanation:

    From Pythagoras theory,

    x² = 100² - 11²

    x² = 10000 - 121

    x² = 9879

    x = 99.39ft
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