Apothem: definition, formulas, examples and uses Apothem The apothem of a regular polygon is the perpendicular segment from the polygon's center to a side; it equals the inradius and appears in area formulas and polygon geometry.
Archimedean solid A convex uniform polyhedron with regular polygonal faces and identical vertices; distinct from Platonic solids, prisms or antiprisms. Thirteen (or fifteen counting chiral pairs) cl…
