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The area enclosed between the circumfere...

The area enclosed between the circumferences of two concentric circles is `16picm^(2)` and their radii are in the ratio 5 : 3. What is the area of the outer circle ?

A

`9pi cm^(2)`

B

`16pi cm^(2)`

C

`25pi cm^(2)`

D

`36pi cm^(2)`

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