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= 40 × 30
= 1200 cm²
L jaring2 balok
= 2×(pl+pt+lt)
= 2×(20×5+20×10+5×10)
= 2×(100+200+50)
= 2×350
= 700 cm²
L karton yg tdk terpakai
= L karton - L jaring2 balok
= 1200 - 700
= 500 cm²