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[Not Homework!] Polar Equation Problem Involved Tangents

  1. Apr 15, 2012 #1
    Not homework, just trying to learn how to solve this problem for an exam.

    1. The problem statement, all variables and given/known data

    https://dl.dropbox.com/u/23889576/Screenshots/10.png [Broken]

    2. Relevant equations

    [itex]\int_{a}^{b} \sqrt { (\frac{dr}{dθ})^2 + r^2 }\, dθ[/itex]

    3. The attempt at a solution

    Had much difficulty, could not even derive the original derivative function for this problem.
     
    Last edited by a moderator: May 5, 2017
  2. jcsd
  3. Apr 15, 2012 #2

    tiny-tim

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    welcome to pf!

    hi suporia! welcome to pf! :wink:

    the figure is symmetric, so when one bug is at (r,θ), the next is at (r,θ+π/2) …

    does that help? :smile:
     
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