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486cm²=6a² |:6
a²=81cm²
√a=√81cm²
a=9cm
V=a³
V=9³
V=729cm³
wzór na pole powierzchni całkowitej sześcianu to,
P = 6a^2
a więc
6a^2=486
a^2= 486 : 6
a^2= 81
a = 9 [cm] – krawędź sześcianu
V= a^3
V =9^3
V = 729 [cm^3 ]