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6 × 10 × 10 = 600
luas permukaan balok = 2 (p×l + p×t + l×t)
2 (20×10 + 20×12 + 10×12)
2 (200 + 240 + 120)
2 × 560
1120
maka luas permukaan kubus + luas permukaan balok = 600 + 1120 = 1.720
maaf kalau salah :)