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d=6
a√2=6
a=6√2÷2
a=3√2
P=a²
P=(3√2)²
P=18
Pb=18×3
Pb=54
P=a²√2÷4
P=(3√2)²√2÷4
P=18√2÷4
Pp=2×18√2÷4
Pp=36√2÷4
Pp=9√2
Pc=Pb+Pp
Pc=54+9√2
2. liczba krawędzi w sześcianie - 12
240cm÷12=20cm
P=12cm×12cm=144cm²
Pc=144cm²×6=864cm²