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Calculate the circle circumfrance's upper bound if the area is 400cm(square)

 Oct 20, 2018
edited by Guest  Oct 20, 2018
edited by Guest  Oct 20, 2018
edited by Guest  Oct 20, 2018
edited by Guest  Oct 20, 2018

Best Answer 

 #1
avatar+4402 
+2

\(C = 2 \pi r\\ A = \pi r^2 = \dfrac{C^2}{4\pi}\\ C= \sqrt{4\pi A} = \sqrt{1600\pi}=40\sqrt{\pi}~cm\)

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 Oct 20, 2018
 #1
avatar+4402 
+2
Best Answer

\(C = 2 \pi r\\ A = \pi r^2 = \dfrac{C^2}{4\pi}\\ C= \sqrt{4\pi A} = \sqrt{1600\pi}=40\sqrt{\pi}~cm\)

Rom Oct 20, 2018
 #2
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is this for the upper bound ?

 Oct 20, 2018
 #3
avatar+17231 
+2

That is the maximum....actually, the ONLY  C  for a circle with area = 400 cm^2

ElectricPavlov  Oct 20, 2018

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