# Concentric Circles

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Two circles are said to be concentric if they have the same center. The following figure shows two concentric circles with the same center O:

Note that any two concentric circles whose radii are r1 and r2 (with$${r_1} > {r_2}$$) will form a ring-shaped region between them, as shown below:

Observe that the width of this ring-shaped region will be $${r_1} - {r_2}$$.

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