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3. Suppose a ladder is 12 ft. long. The base of the ladder is 5 ft. from a wall, and the top of the ladder is leaning against the wall. How far above the ground is the tip of the ladder?

  • math - ,

    Use the Pythagorean Theorem -- with c = 12 and b = 5. Solve for a.

    a^2 + b^2 = c^2

  • math - ,

    use a^2 +b^2=c^2
    144+25=c^2
    169= c^2
    13=c so 13ft.

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