| Set of rotundas | |
| Faces: | 1 -gon 1 -gon pentagons triangles |
| Symmetry: | order |
| Rotation Group: | order |
| Properties: | convex |
In geometry, a rotunda is any member of a family of dihedral-symmetric polyhedra. They are similar to a cupola but instead of alternating squares and triangles, it alternates pentagons and triangles around an axis. The pentagonal rotunda is a Johnson solid.
Other forms can be generated with dihedral symmetry and distorted equilateral pentagons.