this actually represents the amount of triangles that the polygon is able to be partitioned into from the same vertex? That’s why you then multiply by 180° - that’s the sum of the internal ...

Other 3D shapes with least one curved surface are not polyhedra ... The vertices of a pyramid are around the polygon base plus the apex vertex. A triangle-based pyramid has four vertices.

this actually represents the amount of triangles that the polygon is able to be partitioned into from the same vertex? That’s why you then multiply by 180° - that’s the sum of the internal ...