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p:l:t = 5:4:3
v = 1620cm²
volume balok = p.l.t
1620 = 5x.4x.3x
1620 = 60x
x = 1620/60
x = 27
p = 5x
= 5.27
= 135 cm
l = 4x
= 4.27
= 108cm
t = 3x
= 3.27
= 81 cm
2.
sisi kubus = 5 cm
sisi balok = 7.5.4
a. volume kubus =
=s³
= 5³
= 125 cm³
volume balok =p.l.t
=7.5.4
= 140 cm³
b. perbandingan volume = 125:140
= 25:28