Set of intersection points in trilateration / multilateration

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Like in this post I will get a set of points (3 or more) with latitude, longitude and distance (in KM) information to find out the target location. A distance could be about 500 KM. The circles (unlike the above question) doesn't intersect in the same point which results in a set of points forming a region of a possible location.

Based on this explanation, I managed to write a java function that returns the set of intersection points for a set of circles (x,y,radius in CM) in the Cartesian coordinate system. But I don't know if I can adapt this function to get the intersection points of circles on the earth. Is this possible? Is there another better solution?

Thanks in advance!



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