The polygons adopted were of 20 or more sides approximating to a circular form.
These have faces which are all regular polygons, but not all of the same kind, while all their solid angles are equal.
" Regular polyhedra " are such as have their faces all equal regular polygons, and all their solid angles equal; the term is usually restricted to the five forms in which the centre is singly enclosed, viz.
Partial Polygons of Resistance.In a structure in which there are pieces supported at more than two joints, let a polygon be con-.
- These solids have all their faces equal regular polygons, and the angles at the vertices all equal.