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Point along a circle
I am trying to find a point along a circle (see the picture).
R  is the radius of the circle (known)
C  is the length from the edge of the circle to the centre (known)
d  is a known distance from the centre, along C
I need to know the point along the dish arc distance "d" away from the centre at a right angle to C
Any help?
thanks

If I'm reading the question properly, the point that you're looking for is independent of C isn't it ? You're simply offsetting from a vertical diameter by a distance d.
Call your point P and run a horizontal to Q on the vertical diameter. Then, if the centre of the circle is O, $\displaystyle OQ^{2}+QP^{2}=OP^{2}.$
That is, $\displaystyle OQ^{2}=R^{2}d^{2}.$