Not concentric.
Eccentric
See also
Concentric, ConcyclicExplore with Wolfram|Alpha
Cite this as:
Weisstein, Eric W. "Eccentric." From MathWorld--A Wolfram Web Resource. https://mathworld.wolfram.com/Eccentric.html
Not concentric.
Weisstein, Eric W. "Eccentric." From MathWorld--A Wolfram Web Resource. https://mathworld.wolfram.com/Eccentric.html