such that:
1 They are vertices of concave polygons.
2 All the concave polygons have more than one inner angle with degree > 180.
You can either show a picture or list the coordinates of the points.
If you are inetrested, you can change (2) to be
2' All the concave polygons have exactly two inner angles with degree > 180.
1 They are vertices of concave polygons.
2 All the concave polygons have more than one inner angle with degree > 180.
You can either show a picture or list the coordinates of the points.
If you are inetrested, you can change (2) to be
2' All the concave polygons have exactly two inner angles with degree > 180.