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22 November, 21:58

C.) If the area of a circle is 121 square units, what is its diameter?

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Answers (1)
  1. 22 November, 22:08
    0
    12.41

    Step-by-step

    A

    =

    π

    *

    r

    2

    If you know the area, then you can find the radius:

    Divide the area by

    π

    , then find the square root.

    r

    =



    A

    π



    r

    =



    121

    π

    π

    =



    121

    =

    11

    units

    Once you know the radius, you can find the circumference:

    C

    =

    2

    *

    π

    *

    r

    =

    2

    *

    3.14

    *

    11

    C

    =

    69.08



    69.1

    units
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