Zero, or all if the circles coincide.
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If the circles have the same radius then an infinite number, and if they do not, then none.
It can be only 1 * * * * * Infinitely many concentric circles can be drawn.
Since there is no requirement for the line to be straight, the answer is infinitely many. Otherwise, 4.
I suggest 90.
um i think one? sorry i really don't know! he he he