+0  
 
0
81
1
avatar

31.4 square miles

62.8 square miles

78.5 square miles

100.4 square miles

 

helpppp

Guest Oct 11, 2018
edited by Guest  Oct 11, 2018
 #1
avatar+3190 
+1

I guess they just want 

 

\(A = \pi r^2 = \pi \left(\dfrac{D}{2}\right)^2 \\ D=10 \Rightarrow A = \pi(5)^2 = 25\pi \approx 78.5\)

Rom  Oct 11, 2018

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