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= 2(12.5) +2(12.4) + 2(5.4)
= 2.60 + 2.48 + 2.20
= 120 + 96 + 40
= 256
2. L permkn sisi kubus = 4.5.5
= 100
L seluruhnya = 256 + 100 = 356 cm²
semoga bener ya... :)