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480 = 6x . 2x . 5x
480 = 60 x³
x³ = 8
x = 2
p =6x = 12
l = 2x = 4
t = 5x = 10
luas permukaan = 2 ( PL + PT + LT)
= 2 ( 12x4 + 12x10 + 4x10)
= 2 x 208
= 416