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4.4=16
4.3,5= 14
20 + 16 + 14 = 50 cm
1500: 50 = 30 balok
= 4×(p+l+t)
= 4×(5+4+3,5)
= 4×12,5
= 50 cm
Banyak kerangka balok yg dpt dibuat
= 15 m/50 cm × 1 buah
= 1500 cm/50 cm × 1 buah
= 30 buah