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Lp = 2( 50 x 40 + 50 x 30 + 40 x 30)
= 2(2.000 + 1.500 + 1.200)
= 2(4700)
= 9.400 cm²
Luas karton yang tersedia = 1 m² = 10.000 cm²
Luas karton yang tersisa = 10.000 - 9.400
= 600 cm²
L.permukaan balok= 2((pxl) +(pxt) +(lxt))
2x((50x40)+(50x30)+(40x30))
2x(2000+1500+1200)
2x(4700)
9400 cm2
94 m2
luas yg tersisa=100-94=6m2