Sounds like you just want the sphere/sphere intersection(s) (or circles if you're in 2D).
http://en.wikipedia.org/wiki/Sphereâsphere_intersection
http://mathworld.wolfram.com/Circle-CircleIntersection.html
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#1Nypyren
Posted 05 January 2013 - 07:46 PM
Sounds like you just want the sphere/sphere intersection(s) (or circles if you're in 2D).
http://en.wikipedia.org/wiki/Sphere%E2%80%93sphere_intersection
http://en.wikipedia.org/wiki/Sphere%E2%80%93sphere_intersection