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A ring shaped region is shown below. It's inner radius is 17 yd, and its outer radius is 22 yd. find the area of the shaded region. 

 Apr 30, 2021
 #1
avatar+258 
+3

22^2 pi - 17^2 pi = (484 - 289) * pi = 195 pi

laugh

 Apr 30, 2021
 #2
avatar+1300 
+2

A cool way to do 22^2-17^2 = (22+17)(22-17) = 39 * 5 = 195

:))

 

=^._.^=

catmg  Apr 30, 2021
 #3
avatar+258 
+2

when memorization is less efficient

 
MathProblemSolver101  Apr 30, 2021

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