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ConvexHull

ConvexHull[{{x1, y1}, {x2, y2}, ...}]
yields the planar convex hull of the points {{x1, y1}, ...}, represented as a list of point indices arranged in counterclockwise order.
  • The following option can be given:
AllPointsTruewhether to include all distinct points
  • With the setting AllPoints->False only the minimum set of points needed to define the hull is returned.