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Math Help - finding parametric representation of half circle

  1. #1
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    finding parametric representation of half circle mmn16 1a

    i have a curve from(-2,0) to (2,0) half circle

    how to find the formula for x
    and y
    ?

    i know that its some sort of trigonometric expression
    Last edited by transgalactic; May 29th 2011 at 12:47 AM.
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  2. #2
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    Quote Originally Posted by transgalactic View Post
    i have a curve from(-2,0) to (2,0) half circle

    how to find the formula for x
    and y
    ?

    i know that its some sort of trigonometric expression
    At the level you're studying at you're expected to know this.

    x = 2 cos(t)
    y = 2 sin(t)

    The domain of t is left for you to find.
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  3. #3
    MHF Contributor Also sprach Zarathustra's Avatar
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    x=R*cos(t)
    y=R*sin(t)

    {IT BECAUSE x^2+y^2=R^2 describes a circle}
    R is the radius. (R=2 in your case)

    t-is angle.

    Now, in your opinion which restriction should be on t to get half circle?
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  4. #4
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    t from 0 to pi
    thanks
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