Question

Coplanar circles that have a common center are called

Answer 1

Concentric circles

Explanation:

They are co-planar, so they lie in the same two-dimensional space. Since they share a common center, they would only differ in radius length. What we would have is a bunch of circles withing other circles sharing a common center. We call those concentric circles

Con- with

Centric - having to do with the center