r=28 A=28*2pi=784pim2
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Raggio $r = \dfrac{c}{2\pi} = \dfrac{56\pi}{2\pi} = \dfrac{56\cancel{\pi}}{2\cancel{\pi}} = 28\,m;$
area $A= r^2·\pi = 28^2·\pi = 784\pi\,m^2.$
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