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Math Help - diagonal

  1. #1
    Junior Member
    Joined
    Sep 2008
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    27

    diagonal

    What is the length of the diagonal of a square with area 40 cm^2
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  2. #2
    Super Member
    Joined
    Jun 2008
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    The area of a square is:
    A = s^2

    Using this you can find the length of the a side of a square. To find the length of the diagonal, think of it as the hypotenuse c of a triangle with legs s. Then, using the Pythagorean Theorem:
    s^2 + s^2 = c^2
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