I have a circle and I need to find a particular point along it.(adsbygoogle = window.adsbygoogle || []).push({});

The circle has a known radius (r), center (a, b), and I know a coordinate point upon it (x1, y1), as well as an arc-length (d). From that point x1, y1, how do I find out the point x2,y2 which is arc-length d away from the point x1, y1 in either direction?

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# Points on a circle.

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