ans.........

Asked by kirtichawla94 | 28th Oct, 2009, 07:18: PM

Expert Answer:

Rin and Rout be the radii of inner and outer circle respectively.

πRout2  - πRin2  = 770

Rout2  - Rin2  = 770x7/22 = 245

Rin2 = Rout2 - 245 = 212 - 245 =  196.

Rin = 14

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Answered by  | 29th Oct, 2009, 12:16: AM

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