My Math Forum Vector Calculus problem 2

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September 8th, 2017, 07:18 PM   #1
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Vector Calculus problem 2

From the attachment, I managed to get the answers correct till surface area however I can't seem to get the vertical height of a helicoid becasue I dont know how to get it. What is the solution and how to get to that ?
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 September 8th, 2017, 08:27 PM #2 Senior Member     Joined: Sep 2015 From: USA Posts: 1,931 Thanks: 999 maybe I'm missing something but $z = 2v$ and $0 \leq v \leq 2\pi$ so the vertical height should be $4\pi - 0 = 4 \pi$ Thanks from Robotboyx9

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