From GeoGebra Manual
- Hull[ <List of Points> , <Percentage> ]
- Creates a characteristic hull of the points as described in Efficient generation of simple polygons for characterizing the shape of a set of points in the plane. For percentage p=1, result is the same as the result of ConvexHull Command. The lower percentage, the lower area of the hull. For p=0 the area of resulting shape is not necessarily minimal.
- Returned object is a locus, so it is auxiliary.
Note: Values of p greater than 1 are treated as 1, values less than 0 are treated as 0.