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See image.

 

 May 24, 2020
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A line segment is 8

 

Let the radius of a larger circle be   X

 

The radius of a smaller circle is:     Y = sqrt( X² - 4² ) 

 

The area of a larger circle    A= X² * pi   

 

The area of a smaller circle    A2 = Y² * pi      

 

The area of the green ring     A3 = A1 - A2     smiley     

 

( I think that my dumb answer matches the question.) cheeky

 May 24, 2020
edited by Guest  May 24, 2020

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