Two geometric figures are said to be concentric if their centers coincide. The region between two concentric circles is called an annulus.
The following table summarizes some concentric central circles.
Two geometric figures are said to be concentric if their centers coincide. The region between two concentric circles is called an annulus.
The following table summarizes some concentric central circles.
Weisstein, Eric W. "Concentric." From MathWorld--A Wolfram Web Resource. https://mathworld.wolfram.com/Concentric.html