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math

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a 15 foot ladder is placed against a vertical wall of a building with the bottom of the ladder stand on level ground 12 feet from the base of the building. How high up the wall does the ladder reach?

  • math - ,

    a^2 + b^2 = c^2

    a^2 + 12^2 = 15^2

    a^2 + 144 = 225

    a^2 = 81

    a = 9

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