The convex hull of a set ps of points is the smallest convex polygon P for which each point in ps is either on the boundary of P or in its interior.

The result is returned as a list of points (vertices) of the convex polygon P in counter-clockwise order.

The routine uses an  algorithm computing tangents of pairs of points.

For an equivalent command with a few more options, see simplex[convexhull].  Input and output are simple points rather than geometric points, and the output can be the area enclosed in the polygon, the points defining the vertices, or a plot of the polygon.

The command with(geometry,convexhull) allows the use of the abbreviated form of this command.