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  1. #1
    Star Lounger
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    Maths problem (2002 sr1)

    Does anyone know the maths to calculate the following:

    if the centre of a circle is at point (50,50) and it has a radius of 30

    What are the coordinates for a point on the circumference x degrees clockwise from the top of the circle?

    eg.
    top of the circle coordinates = 50, (50-radius) = 50,20
    90 degrees clockwise will be 50+radius,50 = 80,50

    so at 40 degrees clockwise will be somewhere between the 2.

    I'm guessing I'll need to use triangles and differentiation etc but am a bit rusty.

    If you could explain what you do as well that would be great

    (in all cases I have assume x,y coords)

    Thanks

    Simon

  2. #2
    Super Moderator
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    Re: Maths problem (2002 sr1)

    Hi Simon,

    If your angle (in degrees) is in A1, the X coordinate is at:
    =SIN(RADIANS(A1))*30+50
    and the Y coordinate is at:
    =50-COS(RADIANS(A1))*30

    Cheers
    Cheers,

    Paul Edstein
    [MS MVP - Word]

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