Luas permukaan balok
[tex]2(p \times l + p \times t + l \times t) \\ 2(20 \times 9 + 20 \times 7 + 9 \times 7) \\ 2(180 + 140 + 63) \\ 2(383) \\ 766 \: {cm}^{2} \: (B)[/tex]
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Luas permukaan balok
[tex]2(p \times l + p \times t + l \times t) \\ 2(20 \times 9 + 20 \times 7 + 9 \times 7) \\ 2(180 + 140 + 63) \\ 2(383) \\ 766 \: {cm}^{2} \: (B)[/tex]