[tex]a) \\ A = 19321 \;cm^2 \\ L= \sqrt{19321} = 139 \\ P = 4L = 4*139 = 556\;cm \\ \\ b) \\ A = 16,4025 \;cm^2 \\ L= \sqrt{16,4025} = 4,05 \\ P = 4L = 4*4,05 = 16,2\;cm \\ \\ c) \\ A = 0,252004 \;cm^2 \\ L= \sqrt{0,252004} = 0,502 \\ P = 4L = 4*0,502 = 2,008\;cm [/tex]