AC(20/3-1) = 17AC/3 = 68
AC = 68/17*3 = 12 cm
BD = 68+12 = 80 cm
lato AB = √(BD/2)^2+(AC/2)^2 = √40^2+6^2 = √1636 = 40,4475 cm
perimetro 2p = AB*4 = 161,790 cm
area A = AC*BD/2 = 40*12 = 480 cm^2
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