By some means it's a magic quantity. A lot of the tips I have read through thus far claims that I'll actually really have to do style somthing like that:The faces in the pentagonal prism would be the flat surfaces in the prism. World-wide-web the prism is Minimize by a bit plane inclined at 30° to h.Rob RolnickRob Rolnick 10.4k22 gold badges3030 s