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Sehingga, lebarnya :
l = (x + 1) cm
L = 72 cm²
L = p × l
72 = (3x - 3) (x + 1)
72 = 3x² + 3x - 3x - 3
72 = 3x² - 3
24 = x² - 1
x² = 24 + 1
x² = 25
√x² = √25
x = 5
l = x + 1
= 5 + 1
= 6 cm
Jadi lebarnya adalah 6 cm (C).