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Mathematics
Calculus
Surface area of a revolution, why is this wrong?
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[QUOTE="Mark44, post: 6003116, member: 147785"] Yes, your way of thinking is wrong. You have to take into account the shape of the curve. Your way would work if you were dealing with a cylinder, but it doesn't work for a surface of revolution. ##\Delta x## is not a good approximation of the distance between the points ##(x, f(x))## and ##(x + \Delta x, f(x + \Delta x)##. Take a look at the video that [USER=376845]@jedishrfu[/USER] showed. [/QUOTE]
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Forums
Mathematics
Calculus
Surface area of a revolution, why is this wrong?
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