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A 20 foot ladder is leaning against the side of a building. The bottom of the ladder is 4 feet from the wall. How many feet above the ground does the ladder touch the wall?

  • Math -

    The ladder, the ground, and the wall make a right triangle. Use the pythagorean theorem to find the height.

    a^2 + b^2 = c^2

    a^2 + 4^2 = 20^2

    a^2 + 16 = 400

    a^2 = 384

    a = 19.5959

  • Math -

    16

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