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A 40-foot by 10-foot rectangular garden is enclosed by a fence. To make the garden larger, while using the same amount of fencing, its shape is changed to a square. How many square feet larger than the old garden is the new garden?

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2 answers
  1. old area = 400 ft^2

    perimeter = 20+80 = 100
    so
    4 s = 100
    s = 25

    s^2 = area = 625

    625 - 400 = ???

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  2. 40 * 10 = 400 square feet

    The fence is 100 feet long

    25 * 25 = 625 square feet

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    Ms. Sue

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