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1280 = 1/3.4x.3x.5x ⇒ l = 3(4) = 12 cm
1280.3 = 60x³ ⇒ t = 5(4) = 20 cm
3840 = 60x³
x³ = 64
x = 4 c
panjang diagonal = √16²+12²
= 20