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486cm²=6a²/6
81cm²=a²/√
9cm=a
V=a³
V=729cm³
Odp objetosc tego szescianu wynosi 729cm³
p=6a²
6a²=486cm²
a²=486:6
a²=81
a=9cm
objetośc wyraża sioę wzorem:
v=a³=9³=729cm³