Concentric
Geometric objects with a common centre
Concentric objects share the same center, axis, or origin. Circles,spheres, cylinders, tubes, and other round objects can be concentric. Concentric shapes do not normally have the same radius.
![](http://up.wiki.x.io/wikipedia/commons/thumb/6/68/Bullseye_%283_circles%29.svg/220px-Bullseye_%283_circles%29.svg.png)
Concentric objects share the same center, axis, or origin. Circles,spheres, cylinders, tubes, and other round objects can be concentric. Concentric shapes do not normally have the same radius.