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Math Help - Finding a point on a circle

  1. #1
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    Finding a point on a circle

    Hi,

    Could someone help me calculate a specific point on a circle when already given:

    1) the radius of the circle
    2) a point on the circle
    3) and the angle of rotation away from that point.

    So say a point moved 45 degrees along the circumference how do you calculate the co-ordinates of the new point?

    Thanks,

    Colm
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  2. #2
    Moo
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    Hello,

    This may be difficult if you're not given the center of the circle or something like that
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  3. #3
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    sorry I should have clarified that the circle is centered on the origin.
    thanks.
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    Quote Originally Posted by earls View Post
    Hi,

    Could someone help me calculate a specific point on a circle when already given:

    1) the radius of the circle
    2) a point on the circle
    3) and the angle of rotation away from that point.

    So say a point moved 45 degrees along the circumference how do you calculate the co-ordinates of the new point?

    Thanks,

    Colm
    HINT: How do you describe the point on the circle using polar coordinates?

    -Dan
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