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K = 2(p + l)
84 = 2((2l - 6) + l)
84 = 2(2l - 6 + l)
84 = 2(3l - 6)
84 = 6l - 12
6l = 84 + 12
6l = 96
l = 16
Jadi lebarnya adalah 16 cm.