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anonymous

  • 5 years ago

I need the area of circle that is 2" in with the DIA of the disk is 8.5"

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  1. amistre64
    • 5 years ago
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    what??

  2. anonymous
    • 5 years ago
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    I have a disk at is 8.5 inches in Dia. there is 2 inches of this disk I am trying to figure out the area.

  3. amistre64
    • 5 years ago
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    so if we had a circle and you chopped off an end of it, how much area would it be? like this?

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  4. anonymous
    • 5 years ago
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    The 2 inches is the dia too (a complete circle) not a segment.

  5. amistre64
    • 5 years ago
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    like this then? maybe?

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  6. anonymous
    • 5 years ago
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    yes something like that. I know the raduis is 4.25

  7. anonymous
    • 5 years ago
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    let say the white part is the 2 "

  8. amistre64
    • 5 years ago
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    ohhh...ok

  9. amistre64
    • 5 years ago
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    diam/2 = 8.5/2 = 4.25 the area of the whole thing then is: (4.25)^2pi now remove the area of the inner circle which has the radius of 2.25 (4.25)^2 pi - (2.25)^2 pi = pi( 4.25^2 - 2.25^2)

  10. amistre64
    • 5 years ago
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    13pi is what I come up with

  11. amistre64
    • 5 years ago
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  12. anonymous
    • 5 years ago
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    Where does the 2.25 come from?

  13. anonymous
    • 5 years ago
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    Thanks I think I figured it out!

  14. amistre64
    • 5 years ago
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    :) I knew you could do it :)

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