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# Two or more circles having the same centre but different radii are said to be

$\begin{array}{1 1}(A)\;\text{Pi circles}\\(B)\;\text{Concurrent circles}\\(C)\;\text{Similar circles}\\(D)\;\text{Concentric circles}\end{array}$

Two or more circles having the same centre but different radii are said to be concentric circles
Hence (D) is the correct answer.