anonymous
  • anonymous
I need some help finding the surface area of this figure...
Mathematics
  • Stacey Warren - Expert brainly.com
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SOLVED
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jamiebookeater
  • jamiebookeater
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anonymous
  • anonymous
1 Attachment
UnkleRhaukus
  • UnkleRhaukus
a little circle a big circle and an trapezium
UnkleRhaukus
  • UnkleRhaukus
|dw:1333783298213:dw| It is not a trapezium but a difference of sectors

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UnkleRhaukus
  • UnkleRhaukus
|dw:1333783389861:dw|
UnkleRhaukus
  • UnkleRhaukus
do you mind if i work in radians (or do you prefer degrees) radians will be simpler
anonymous
  • anonymous
Radians is fine! c:
UnkleRhaukus
  • UnkleRhaukus
how do we find the extra height to the nonexistant apex of the cone
anonymous
  • anonymous
Do you know the final answer so i can confirm? is it 388.355? if yes then ill explain it
UnkleRhaukus
  • UnkleRhaukus
|dw:1333784950944:dw|
anonymous
  • anonymous
I don't really know what the final answer is (or how to find the extra height). :c
anonymous
  • anonymous
|dw:1333785068455:dw| i just added the surface areas of these two figures..
anonymous
  • anonymous
suface area of cone + surface area of circle
UnkleRhaukus
  • UnkleRhaukus
but the bit that goes round the middle is not a sector , it is a difference of sectors
anonymous
  • anonymous
im not sure its right though
anonymous
  • anonymous
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...

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