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lebar = 4 cm²
tinggi. = 32 cm²
1120=2(3x*1x+1x*8x+3x*8x)
1120=2(3x kuadrat+8x kuadrat+24x kuadrat)
1120=2(35x kuadrat)
1120=70x kuadrat
x kuadrat=1120 bagi 70
x=akar pangkat dua dari 16
x=4cm
panjang balok adalah 3x=3*4=12cm