| #### D.13.4.8 latticeArea Procedure from library `polymake.lib` (see polymake_lib). Usage: latticeArea(polygon); polygon list Assume: polygon is a list of integer vectors in the plane Return: int, the lattice area of the convex hull of the lattice points in polygon, i.e. twice the Euclidean area Example:
    LIB "polymake.lib";
    // define a polygon with lattice area 5
    list polygon=intvec(1,2),intvec(1,0),intvec(2,0),intvec(1,1),
    intvec(2,1),intvec(0,0);
    latticeArea(polygon);

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