The radii of two concentric circles are $14\, cm$ and $10.5 \,cm .$ Then, the difference between their circumferences is $\ldots \ldots \ldots . cm .$
The radii of two concentric circles are $14\, cm$ and $10.5 \,cm .$ Then, the difference between their circumferences is $\ldots \ldots \ldots . cm .$
- A
$3.5$
- B
$7$
- C
$11$
- D
$22$
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