page_title: Concentric objects
hierarchical_section_title: Concentric objects
context_page_description: In geometry, two or more objects are said to be concentric, coaxal, or coaxial when they share the same center or axis. Circles, regular polygons and regular polyhedra, and spheres may be concentric to one another, as may cylinders.
context_section_description: In geometry, two or more objects are said to be concentric, coaxal, or coaxial when they share the same center or axis. Circles, regular polygons and regular polyhedra, and spheres may be concentric to one another (sharing the same center point), as may cylinders  (sharing the same central axis).
caption: Kepler's cosmological model formed by concentric spheres and regular polyhedra
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