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College Math II

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Find the exact length of the side of a square whose diagonal is 3 feet.

I am having problems understanding how you figure out this problem. Can someone help me? Thanks.

  • College Math II -

    Draw a square. Draw a diagonal. Let each side length be x.

    The Pythagorean theorem tells you that x^2 + x^2 = 2x^2 = 3^2 = 9
    Solve for x.

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