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648000 = 120 . 90 . t
648000 = 10800 t
t = 648000 /10800
t = 60 cm
2. L.Sisi Tegak = 4 * (20*26/2)
= 4 * 260 cm²
= 1040 cm²
L = L.Alas + L.sisi tegak
= (20*20) + 1040 cm²
= 400 cm² + 1040 cm²
L = 1440 cm²
1L = 1000cm³
648L = 648000cm³
648000 = 120*90*T
648000 = 10800T
T = 648000/10800
T = 60 cm
============
L = s² + 4(1/2*a*t)
L = 20² + 4(1/2*20*26)
L = 400 + 1040
L = 1440 cm²