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p = 3a
l = 3a
t = a
V = 432
p l t = 432
3a (3a)(a) = 432
9a³ = 432
a³ = 48
a=∛48 = 2∛6
.
luas balok = 2(pl+pt + lt)
L = 2{ 3a(3a) + 3a(a) + 3a(a)}
L= 2(9a² + 3a² + 3a²)
L = 2(15 a²)
L = 30 a²
L = 30 (2∛6)²
L= 30(4)∛36
L = 120∛36