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5 x 3=15
3 x 4=12
20+15+12=47 x 2=94
volume = 4 x 5 x 3=60
b.Luas permukaan =4 x 3 =12
3 x 2=6
2 x 4=8
12+6+8=26 x 2=52
volume = 4 x 3 x 2 =24