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Questions  >>  SAT  >>  Math  >>  Circles
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Two concentric circles have circumference $4\pi$ and $10 \pi$. What is the difference of the radii of two circles ?

$\begin{array}{1 1} (a)\; 4 \\ (b)\; 3 \\ (c)\; 2 \\ (d)\; 1 \end{array}$

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