Dismiss Notice
Join Physics Forums Today!
The friendliest, high quality science and math community on the planet! Everyone who loves science is here!

Finding lengths of curves

  1. Feb 22, 2014 #1
    I am just learning how to find lengths of curves using calculus. √((dx)2+(dy)2)→∫√(1+(dy)2)dx. My question is how are you able to bring out the dx. Is this some sort of algebraic trick I've never heard of. Can someone please explain this to me?
     
  2. jcsd
  3. Feb 22, 2014 #2
    nevermind, you just multiply by dx/dx
     
  4. Feb 23, 2014 #3

    mathman

    User Avatar
    Science Advisor
    Gold Member

    You should have √(1+(dy/dx)²) for the second integrand.
     
  5. Mar 11, 2014 #4
    It is [{1+(dy/dx)^2}^0.5]dx = Length of curve
     
Know someone interested in this topic? Share this thread via Reddit, Google+, Twitter, or Facebook




Similar Discussions: Finding lengths of curves
  1. Length of a curve (Replies: 8)

Loading...