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4x15dm= 60dm = 600cm
4x120cm= 480cm
1200+600+480= 2280 cm / 228 dm / 22,8 m
Panjang kawat dibutuhkan :
P. Kawat = 4 ( P + L + T)
= 4 (300cm + 150cm + 120cm)
= 4(570cm)
= 2.280 cm