Area del rombo,AD+CB=57AD-CB=9
AD=x
CB=y
{x+y=57
{x-y=9
Somma- differenza: sistema
x=(57+9)/2---------> x=33 cm (i cm li suppongo io)
y=(57-9)/2----------> y= 24 cm
Area rombo=1/2*33*24=396 cm^2
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