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258 = 2(9*5 + 9t + 5t)
129 = 45 + 14t
84 = 14t
t = 6 cm
V = plt
= 9*5*6
= 270 cm3
l= 5 cm
Lp= 258 cm²
Lp=2(pl+pt+lt)
258=2(9·5 + 9·t + 5·t)
258=2(45+14t)
258=90+28t
258-90=28 t
168=28 t
6=t
tinggi= 6 cm
v=p·l·t
v=9·5·6
v=270 cm³