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

critical
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

edited by Guest Oct 20, 2018

edited by Guest Oct 20, 2018

edited by Guest Oct 20, 2018

#1**+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

#3**+2 **

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

ElectricPavlov
Oct 20, 2018