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Answer:
Common three-circle patterns of triangulation 2) Rare Patterns of Circles in Triangulation Fig. 4 illustrates rare patterns of circles in triangulation. Type 4a has no real solutions. The centers of the circles are taken as the vertices of a triangle and the centroid of the triangle becomes the final location estimate. Type 4b represents the most desirable situation (yet most unlikely) where there is a triple root (Point n), or the final estimate. The average of Points q and r gives the final estimate for Type 4c. Point s is the final estimate for Type 4d and the average of Points t, u, and v gives the final estimate for Type 4e.
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