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L = p x l x t
576 = p x l x 9
p x l = 576/9
p x l = 64
karena L. alas balok = L. alas kubus maka :
pxl = sxs = 64
s = √64
s = 8 cm
jadi panjang rusuk kubus adalah 8 cm
L. Alas Balok = pxl
V. Balok = pxlxt
t = 9 cm
576 = pxlx9
pxl = 576 : 9 = 64 cm² = s²
s = √64 = 8