[tex] Luas permukaan \: balok - (\frac{1}{2} \times l \times t) \\ \\ 2(p \times l + p \times t + l \times t) - ( \frac{1}{2} \times l\times t) \\ \\ 2(20 \times 10 + 20 \times 12 + 10 \times 12) - ( \frac{1}{2} \times 10 \times 12) \\ \\ 2(200 + 240 + 120) - 60 \\ \\ 2(560) - 60 \\ \\ 1.120 - 60 \\ \\ 1.060 \: {cm}^{2} [/tex]
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[tex] Luas permukaan \: balok - (\frac{1}{2} \times l \times t) \\ \\ 2(p \times l + p \times t + l \times t) - ( \frac{1}{2} \times l\times t) \\ \\ 2(20 \times 10 + 20 \times 12 + 10 \times 12) - ( \frac{1}{2} \times 10 \times 12) \\ \\ 2(200 + 240 + 120) - 60 \\ \\ 2(560) - 60 \\ \\ 1.120 - 60 \\ \\ 1.060 \: {cm}^{2} [/tex]