They're definitely similar, concentric, and coplanar. They're
not necessarily congruent, but they could be.
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they lie in the same plane
Skew lines cannot lie in the same plane.
Parallel
Two lines can lie in one plane. For example, parallel lines are lines that intersect and lie in the same plane.
No. You can only define a circle by radius, diameter, area, perimeter. Concentric circles have the same centre, therefore, if they were the same circles with the same radius, then they would all lie on top of each other and be effectively one circle.