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stupidinmath Group Title

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  • 10 months ago
  • 10 months ago

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  1. stupidinmath Group Title
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    Area of full circle: A = πr² A = π(9)² A = 81π A = 254.4690049

    • 10 months ago
  2. superdavesuper Group Title
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    But its not a full circle - its only 240deg....so...

    • 10 months ago
  3. stupidinmath Group Title
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    yeah.. subtract it?

    • 10 months ago
  4. stupidinmath Group Title
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    Or.. idk T.T

    • 10 months ago
  5. superdavesuper Group Title
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    How many deg. are there in a full circle?

    • 10 months ago
  6. stupidinmath Group Title
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    360

    • 10 months ago
  7. liliegirl Group Title
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    @superdavesuper Angle aob measures 120 deg?

    • 10 months ago
  8. superdavesuper Group Title
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    so what do u think? :)

    • 10 months ago
  9. stupidinmath Group Title
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    i'm thinking 240 is the answer.. but how.. im not sure

    • 10 months ago
  10. superdavesuper Group Title
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    @liliegirl yes...according to the drawing.

    • 10 months ago
  11. superdavesuper Group Title
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    No, the shaded area is a PORTION of a full circle...u already calculated the area for a full circule...so what portion is shaded?

    • 10 months ago
  12. liliegirl Group Title
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    @superdavesuper Area of the sector is 27pi so subtract it from the area of the full circle.... Am I correct?

    • 10 months ago
  13. superdavesuper Group Title
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    No need to substract...just a simple ratio and proportion @liliegirl

    • 10 months ago
  14. liliegirl Group Title
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    @superdavesuper The area is 54pi?? Just a guess..... :)))

    • 10 months ago
  15. stupidinmath Group Title
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    the area of full circle minus the unshaded part?

    • 10 months ago
  16. stupidinmath Group Title
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    Any formula or something?

    • 10 months ago
  17. superdavesuper Group Title
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    Full circule - 360 deg. shaded - 270 deg.

    • 10 months ago
  18. stupidinmath Group Title
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    270 or 240? so complicated

    • 10 months ago
  19. liliegirl Group Title
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    Shaded is 240..

    • 10 months ago
  20. stupidinmath Group Title
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    the answer is not 345.53?

    • 10 months ago
  21. liliegirl Group Title
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    My answer is 169.65

    • 10 months ago
  22. superdavesuper Group Title
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    Sorry I miss typed. Shaded is 240 n @liliegirl has the right answer of 54 pi :)

    • 10 months ago
  23. stupidinmath Group Title
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    I see. @liliegirl how did you get it? :)

    • 10 months ago
  24. liliegirl Group Title
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    You have to get the area of the unshaded part.. that is a sector... Area of the sector is \[\pi(9^{2})(180)\div360\] which is 27pi... Then subtract from the area of the full circle (81pi) You'll come up with 54pi. :))

    • 10 months ago
  25. superdavesuper Group Title
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    should be 120deg....or u can simply multiply the total area by 270/360. either way will work out the same.

    • 10 months ago
  26. liliegirl Group Title
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    Sorry.. typo error.. haha it should be 120...

    • 10 months ago
  27. stupidinmath Group Title
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    thank you so much! :)

    • 10 months ago
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