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2014-07-16T15:01:26-03:00
Perimetro = 2x + 2y
60 = 2x + 2y
30 = x + y
y = x - 30

Area = x*y
Area = x*(x-30)
Area = x² - 30x

x² - 30x = 0

x = -b/2a
x = -(-30)/2*1
x = 15

Area = 15*15
Area =  225m²
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