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



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Flapdragon
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UnkleRhaukus
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a little circle a big circle and an trapezium

UnkleRhaukus
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dw:1333783298213:dw
It is not a trapezium but a difference of sectors

UnkleRhaukus
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dw:1333783389861:dw

UnkleRhaukus
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do you mind if i work in radians (or do you prefer degrees)
radians will be simpler

Flapdragon
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Radians is fine! c:

UnkleRhaukus
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how do we find the extra height to the nonexistant apex of the cone

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

UnkleRhaukus
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dw:1333784950944:dw

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

fl3x1
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dw:1333785068455:dw
i just added the surface areas of these two figures..

fl3x1
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suface area of cone + surface area of circle

UnkleRhaukus
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but the bit that goes round the middle is not a sector , it is a difference of sectors

fl3x1
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im not sure its right though

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...