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29. volume = 22/7×14×14×20 = 616×20 = 12.320 cm³(B)
30.volume balok = p×l×t = 32×20×12 = 7.680 cm³
volume prisma = luas alas × tinggi = (32×20:2)×6 = 1.920 cm³
total volume = 7.680+1.920 = 9.600 cm³ (D)