Bila luas alas, luas sisi kanan, dan luas sisi belakang suatu balok berturut-turut 80cm^2 , 32cm^2, dan 40cm^2, maka volume balok tersebut adalah...
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32 = l*t
40 = p*t
80*32*40 = p*l*l*t*p*t
102400 = p kuadrat * l kuadrat * t kuadrat
102400 = (p*l*t) kuadrat
102400 = (volume kubus) kuadrat
akar 102400 = volume kubus
vol kubus = 320 cm kubik