geometrypythagorean
How to know if a point is locate at outer circle?
Having a circle with the centre (xc,yc) with the radius r how to know whether a point (xp,yp) is locate at the outer circle which following in the picture below.
Solution
If inner circle has radius r and outer circle has radius R, then you can check whether point lies in the ring using comparison of squared distances:
dd = (xp - xc)^2 + (yp - yc)^2
if (dd <= R^2) and (dd >= r^2) then
point is in the ring
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