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S³ = 125
s = ∛125
S = 5 cm
jumlah panjang rusuk kubus = 12S
= (12)(5)
= 60 cm
jumlah panjang rusuk balok = 4P + 4L + 4T
(=) 4(7) + 4(5) + 4(T)
(=) 28 + 20 + 4T
(=) 4T + 48
4T + 48 = 60
4T = 12
T = 3 cm
V balok = PLT
= (7)(5)(3)
= 105 cm³