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21 October, 09:40

The area of a square piece of cardboard is 81 square inches

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  1. 21 October, 09:47
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    Lets x = side of square

    Area of square = side times side = x * x = x^2

    Given:

    Area = 81 square inches

    so

    A = x^2

    81 = x^2

    x = √81

    x = 9

    Answer

    side = 9 inches
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