[tex] Luas \: permukaan \: balok -LP \: kubus\\ 2(p \times l + p \times t + l \times t) - (6 \times s \times s) \\ 2(9 \times 5 + 9 \times 9 + 5 \times 9) - (6 \times 3 \times 3) \\ 2(45 + 81 + 45) - 54 \\ 2(171) - 54 \\ 342 - 54 \\ 288 \: {cm}^{2} [/tex]
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[tex] Luas \: permukaan \: balok -LP \: kubus\\ 2(p \times l + p \times t + l \times t) - (6 \times s \times s) \\ 2(9 \times 5 + 9 \times 9 + 5 \times 9) - (6 \times 3 \times 3) \\ 2(45 + 81 + 45) - 54 \\ 2(171) - 54 \\ 342 - 54 \\ 288 \: {cm}^{2} [/tex]