Area of circle A is 121 times the area of circle B. The ratio of the circumference of circle A to that of B is

121 : 1

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1 : 11

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11 : 1

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Cannot be determined

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Solution

The correct option is D 11 : 1
$\frac{C i r c u m f e r e n c e o f A}{C i r c u m f e r e n c e o f B} = \sqrt{\frac{A r e a o f A}{A r e a o f B}}$
$= \sqrt{\frac{121}{\sqrt{1}}} = \frac{11}{1}$

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