Circumference $C$ of the circular ring is:
where $C_{o u t e r}$ and $C_{i n n e r}$ denotes the circumference of outer and inner circles respectively.

C_{o u t e r} + C_{i n n e r}

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C_{o u t e r} - C_{i n n e r}

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C_{o u t e r} C_{i n n e r}

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2 (C_{o u t e r} + C_{i n n e r})

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Solution

The correct option is A $C_{o u t e r} + C_{i n n e r}$

Total circumference of the edges of the ring is sum of both inner and outer circumferences.

$C = C_{o u t e r} + C_{i n n e r}$

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