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A circular ring has a cross-section as shown (left). If the outer radius is 22 mm and the inner radius 20 mmm, calculate the cross-sectional area of the ring. 
 

do we get it this way:
pi 22^2 = 484 pi
pi 20^2 =400 pi
then subtract them?
or is this wrong????
 

 
 Jun 7, 2021
 #1
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Yes, that is correct....subtract the smaller from the larger area to get the area betweem them.

 
 Jun 7, 2021

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