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A 13 foot ladder is leaning against a building.The bottom of the ladder is 5 feet from the building.How high up does the ladder meet the wall?

  • math -

    Use the Pythagorean Theorem.

    a^2 + b^2 = c^2

    a^2 + 5^2 = 13^2

    a^2 + 25 = 169

    a^2 = 169 - 25

    a^2 = 144

    a = 12

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