Concentric facts for kids

Kids Encyclopedia Facts
Kepler-solar-system-2
Kepler's cosmological model formed by concentric spheres and regular polyhedra

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).

Applications and examples

Archery Target 80cm
An archery target, featuring evenly spaced concentric circles that surround a "bullseye"

The ripples formed by dropping a small object into still water naturally form an expanding system of concentric circles. Evenly spaced circles on the targets used in target archery or similar sports provide another familiar example of concentric circles.

Coaxial cable is a type of electrical cable in which the combined neutral and earth core completely surrounds the live core(s) in system of concentric cylindrical shells.


Concentric Facts for Kids. Kiddle Encyclopedia.