Definition:Ring (Geometry)

Definition

 * Ring.png

Let $C_1$ and $C_2$ be a pair of concentric circles.

Let $r_1$ and $r_2$ be their radii, where:


 * $r_1 > r_2$

Then the ring formed by $C_1$ and $C_2$ is the region bounded between them.

In the above diagram, it is the darker region.

Also known as
It is also known as an annulus.