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p = 3x
K = 2(p + l)
64 = 2(3x + x)
64 = 2(3x + x)
32 = 3x + x
32 = 4x
8 = x
l = x
= 8 cm
p = 3x
= 3(8)
= 24 cm
L = p × l
= 24 cm × 8 cm
= 192 cm²