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P=144cm2
Pc=144cm2*6
Pc=864cm2
P = 6*12^2
P = 6*144
P = 864cm^2
12²=144cm²
P sześcianu=6a²
p sześcianu=6*12²=6*144=864cm²
Odp. Pole sześcianu o boku 12cm wynosi 864cm².
PS liczę na naj;)