SOLUTION: the area of a circular ring is 90.If the radius of the outter circle forming the ring is 10, what is the radius of the inner ring?!
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Question 397637: the area of a circular ring is 90.If the radius of the outter circle forming the ring is 10, what is the radius of the inner ring?!
Answer by robertb(5830) (Show Source): You can put this solution on YOUR website!
Let r = radius of inner ring.
Then
==>
==>
==> , to 3 decimal places.
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