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Lado = (X + 4) [cm]
Perimetro = 4Lado
Perimetro = 4(X+4)
100 = 4X + 16
100 - 16 = 4X
84 = 4X
X = 84/4 = X = 21
Lado = (21 + 4) = Lado = 25 cm
Area = LadoxLado = 25x25 = 25² = 625 cm²
X = 21 cm