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Math Help - Finding points on circles

  1. #1
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    Finding points on circles

    Hi,

    Attached I have a picture of my problem. I know that every circle can be said that is surrounded by a square, but I need to know certain point on a circle. How is that possible pls?
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  2. #2
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    Quote Originally Posted by doobybug View Post
    Hi,

    Attached I have a picture of my problem. I know that every circle can be said that is surrounded by a square, but I need to know certain point on a circle. How is that possible pls?
    1. The equation of your circle is:

    (x-250)^2+(y-250)^2=150^2

    To calculate the coordinates of a ceratin point you must know either the x-value or the y-value of the point.

    2. If you know the angle \alpha between the given radius and the point in question then you can calculate the coordinates of the point P:

    x_P=250+150\cdot \cos(\alpha)

    y_P=250+150\cdot \sin(\alpha)
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  3. #3
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    Red face triangles

    If the other response is too complex. Use (right) triangles and you will be able to figure it out.
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