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The inner and outer Radius of ring I of ...

The inner and outer Radius of ring I of a darboard are 15 cm and 17 cm respectivley and those of ring II are 12 cm and 13 cm respectivley. What is the total area of these two rings?

A

`89 pi cm^2`

B

`25picm^2`

C

`34 picm^2`

D

`106.85pi cm^2`

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