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math

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find the area of this ring to the nearest square unit. Show your work.
The image shows a ring, the inside raius is 2.0m, and the outside radius is 3.2m. The area of the ring is...
plz help!! thx.

  • math - ,

    First, let's get the outside area.

    A = pi * r^2
    A = 3.14 * 10.24
    A = 32.1536

    Now, the inside area:

    A = 3.14 * 2^2
    A = 12.56

    Subtract:

    32.1536 - 12.56 = ?

  • math - ,

    wow. ur really good! =) thank you!

  • math - ,

    You're welcome. :-)

  • math - ,

    Combine like terms, in this case simplify to multiply:
    3.2^2pi its 10.24pi
    2^2pi its 4pi

    then subtract like terms
    (10.24 - 4) pi = 6.24pi
    ~19.59SqU (Square Units)

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