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Flapdragon

I need some help finding the surface area of this figure...

  • 2 years ago
  • 2 years ago

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  1. Flapdragon
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    • 2 years ago
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  2. UnkleRhaukus
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    a little circle a big circle and an trapezium

    • 2 years ago
  3. UnkleRhaukus
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    |dw:1333783298213:dw| It is not a trapezium but a difference of sectors

    • 2 years ago
  4. UnkleRhaukus
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    |dw:1333783389861:dw|

    • 2 years ago
  5. UnkleRhaukus
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    do you mind if i work in radians (or do you prefer degrees) radians will be simpler

    • 2 years ago
  6. Flapdragon
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    Radians is fine! c:

    • 2 years ago
  7. UnkleRhaukus
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    how do we find the extra height to the nonexistant apex of the cone

    • 2 years ago
  8. fl3x1
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    Do you know the final answer so i can confirm? is it 388.355? if yes then ill explain it

    • 2 years ago
  9. UnkleRhaukus
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    |dw:1333784950944:dw|

    • 2 years ago
  10. Flapdragon
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    I don't really know what the final answer is (or how to find the extra height). :c

    • 2 years ago
  11. fl3x1
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    |dw:1333785068455:dw| i just added the surface areas of these two figures..

    • 2 years ago
  12. fl3x1
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    suface area of cone + surface area of circle

    • 2 years ago
  13. UnkleRhaukus
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    but the bit that goes round the middle is not a sector , it is a difference of sectors

    • 2 years ago
  14. fl3x1
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    im not sure its right though

    • 2 years ago
  15. Flapdragon
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    Anyway, thank you both for helping! I'm...still not entirely sure how to do this problem, but I have a couple of ideas now, so...

    • 2 years ago
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