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 Mar 25, 2019
edited by SoulSlayer615  Oct 23, 2019
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Area of innermost red area  =   pi (2/2)^2  =  pi  units^2

 

Area of next red area  =  pi [ (6/2)^2 - (4/2)^2 ]  =  pi [ 3^2 -  2^2 ]  = 5 pi  units^2

 

Area of last red area =  pi [ (10/2)^2 - (8/2)^2 ]  =  pi [ 5^2 - 4^ 2 ]  = 9pi units^2

 

So....the total of the red areas =  

 

pi [ 1 + 5 + 9 ]  =

 

15 pi units^2

 

 

cool cool cool

 Mar 25, 2019

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