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Parametric Equation Question

  1. Jul 23, 2011 #1
    For an assignment, I am supposed to find the parametric equation for the circle:
    x^2+y^2=a^2,
    using as a parameter the arc length, s, measured counterclockwise from the point (a,0) to the point (x,y).

    I understand that the parametric equation for a circle is x=a*cos(t) and y=a*sin(t), but I'm not sure what they are asking me to do in this problem.

    Would anyone be able to get me started on this problem?

    Thanks
     
  2. jcsd
  3. Jul 23, 2011 #2

    SammyS

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    How is t (in radians?) related to the arc length, s?
     
  4. Jul 23, 2011 #3
    Nevermind, I was able to figure it out. They are looking for x=a*cos([itex]\Theta[/itex])=a*cos(s/a) and y=a*sin([itex]\Theta[/itex])=a*sin(s/a).

    Thanks, though.
     
  5. Jul 23, 2011 #4

    SammyS

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    Yes.

    You're welcome.
     
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