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58 = 2(pl + 9 + 4)
29 = pl + 13
pl = 29 -13 = 16
pl=16 maka p = 16/l
pt = 9 maka p = 9/t
sehingga diperoleh
p = p
16/l = 9/t
l = 16t/9
sehingga lt=4 ⇔ (16t/9)t = 4 ⇔ 16t²/9 = 4 ⇔ t² = 4 (9/16) ⇔ t = 3/2 m
V = plt
V = 16 (3/2)
V = 24 m³
Jdi volume balok adalah 24 m³