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

Question

+1

811

3

+693

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

+6251

+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

Rom · Answer 1 · 2018-10-20T08:35:01

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

.

Guest · Answer 2 · 2018-10-20T08:35:47

0

is this for the upper bound ?

Guest Oct 20, 2018

+37165

0

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