Shortest cobweb length - Colegiul National C. Negruzzi (Iași - Roumanie)

Spider Webster is fed up of investing resources and energy in building new cobwebs every day, ans wants to be more pragmatic when building its cobweb. Webster wants to build a cobweb of minimum total length, which connects the n points where it is attached. The considered cases are the triangle, the rectangle, the parallelogram and the regular square-base pyramid.