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OpenStudy (anonymous):
Why you can approximate a curve by dx when computing volume but have to approximate by ds when computing surface area?
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OpenStudy (experimentx):
i guess because of nature of geometry. the volume would include all the space covered while surface would cover only along the curve.
OpenStudy (anonymous):
I don't get the reasoning behind it...
OpenStudy (experimentx):
|dw:1342999630949:dw| ds would give the arc length
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