No.
Concentric circles have the same centre but not [usually] the same radius.
Congruent circles have the same radius, but not [usually] the same centre.
If you have two concentric congruent circles one will be exactly on top of the other.
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Concentric circles have the same center. They are not necessarily the same size. If two concentric circles have the same area, then they are congruent, meaning they coincide when superimposed.
Concentric Circle
A concentric circle looks like a bullseye or a target. It is a big circle with littler circles inside of it with the same centerponit
Concentric Circle
Yes, there can be congruent arcs on a circle. Arcs which subtend the same angle at the center are considered as congruent.