https://math.stackexchange.com/questions/2869725/minimal-surfaces-for-planar-octagons-and-nonagons
sequences and series - Minimal surfaces for planar octagons and nonagons - Mathematics Stack...
4, 6, 8 triangles can make a tetrahedron and up. 6, 8, 9, 10 quadrilaterals can make a cube and up. 12, 16, 18, 20 pentagons can make a tetartoid or...
sequences and seriesminimalsurfacesplanaroctagons