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Parametric equations for a circle

  1. Mar 27, 2005 #1
    The circle [tex] (x-3)^2 + (y-4)^2 = 9[/tex] can be drawn with parametric equations.
    Assume the circle is traced clockwise as the parameter increases.

    if x = 3+3cos(t) then y= _______?

    wouldnt y just be 3+4sin(t)?
  2. jcsd
  3. Mar 27, 2005 #2
    Notice the circle is drawn clockwise, your parameter is -t.

    Also for your y component, you multiply sin(t) by the radius of the circle. The radius of this circle is 3, not 4. so y = 4+3sin(-t) = 4-3sin(t)
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