Math

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Cody has a circular fish pond with a diameter of 6.4 feet around which he wants to put a sidewalk. He has enough concrete left over to cover an area of 65 square feet. Assuming the sidewalk is of uniform width, how wide can the sidewalk around the pond be?

  • Math -

    As = pi*r^2 = 65 Ft^2.=Area of sidewalk.
    r^2 = 20.69
    r2 = 4.55 Ft. = Radius of sidewalk.

    r1 = 6.4/2 = 3.2 Ft. = radius of pond.

    W = r2 - r1 = 4.55 - 3.2 = 1.35 Ft. =
    Width of sidewalk.

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