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A ring-shaped region is shown below.
Its inner radius is 

12cm

, and its outer radius is 

15cm

 May 4, 2023
 #1
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A ring-shaped region is shown below. 
Its inner radius is 

12cm 

, and its outer radius is 

15cm  

 

                              Assuming you want the area of the ring.  

 

                              ARING  =  AOUTER CIRCLE – AINNER CIRCLE  

 

                              ARING  =  π * (152) – π * (122)   

 

                                          =  (3.14)(225) – (3.14)(144)  

 

                                          =  254.34 sq cm  

.

 May 4, 2023

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