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Panjang rusuk kubus :
144 ÷ 12 = 12 cm
Jumlah seluruh sisi kubus = 6
Luas sisi kubus :
L = s²
L = 12²
L = 144 cm²
144 × 6 = 864 cm²
luas sisi = s x s = 12 x 12 = 144