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Math Help - Trying to find the length of a curve.

  1. February 12th 2010, 05:57 PM #1
    Davezerg
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    Trying to find the length of a curve.

    Hello everyone. I'm trying to find the length of a curve from the center line to the distance. I need to fit a bolt bar at 21" from the center line. I need to find the length of the curve in inches or degrees or both if possible. Theres a link below to a picture of what Im trying to do. Please help and thank you for your time.

    This is the formula I have: Distance divided by radius multiplied by sin multiplied by one degree.

    http://i815.photobucket.com/albums/z...ezerg/Sin1.jpg
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  2. February 12th 2010, 06:13 PM #2
    skeeter
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    arclength ...

    s = r \cdot \theta

    s = 60 \cdot \arcsin\left(\frac{21}{60}\right) \approx 21.454 inches
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  3. February 13th 2010, 01:59 AM #3
    Davezerg
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    ok but 21" is not the length of the arc, its the distance from the center line to where I want to fit the bolt bars.
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  4. February 13th 2010, 06:20 AM #4
    skeeter
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    Quote Originally Posted by Davezerg View Post
    ok but 21" is not the length of the arc, its the distance from the center line to where I want to fit the bolt bars.
    I know that. the length of the arc is 21.454 in
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