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Math Help - Test tomorrow and I'm not gettin' it

  1. #1
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    Test tomorrow and I'm not gettin' it

    HELP!! I have a problem: We're doing geometry applications: circles, cylinders and surface area and I'm being given application problems that I am not understanding.


    Solve application problem use 3.14 as the approximate value of (pi) round answers to nearest tenth when applicable.

    An irrigation system moves around a center point to water a circular area for crops. If the irrigation system is 50 yd long, how large is the watered area?

    this is an odd problem in my book, so I know the answer is 7850 sq yds but I CANNOT seem to figure out how they got to than answer
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  2. #2
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    just use the area of a circle with radius of 50 yd.

    Pi*r^2

    3.14 * 50^2 = 7850 yd^2
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