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Mathematics 13 Online
OpenStudy (anonymous):

The area of a circular ring is 90. If the radius is 10, what is the radius of the inner circle of the ring. (Assume the circles forming the ring have the same center.)

OpenStudy (anonymous):

|dw:1326924368144:dw|

OpenStudy (anonymous):

A=Pi * r^2

OpenStudy (anonymous):

the picture wasnt given by the way... i drew it myself

OpenStudy (phi):

|dw:1326924766289:dw|

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