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akan dibuat kubus yg rusuknya 20 cm
maka
6s²
6 x 20²
6 x 400
2400 cm²
dibuat jadi 4===> 4 x 2.400 = 9.600 cm²
luas karton awal = 100 cm x 100 cm = 10.000 cm²
jadi sisa
10.000 cm² - 9.600 cm²
400 cm²