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The possible variants of positioning the two circles in a common point.
- The circles have no common points, and they are off each other.
- The circles have no common points, and they are inside each other.
- The circles have one common point, touching them externally.
- The circles have one common point (B), and they touch internally.
- The circles have two points in common, they intersect. Points I and J are common points and belong to both circles.
6. The circles have no common points, and their centers coincide, they are concentric.
