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h=6cm
V=Pp*h
108cm³=Pp*6cm/:6cm
Pp=18cm²
Pp=a²
18cm²=a²
a=√18cm²
a=√9*2cm²
a=3√2cm-krawędź podstawy
Pc=2Pp+Pb
Pb=4*6cm*3√2cm
Pb=72√2cm²
Pc=2*18cm²+72√2cm²
Pc=36cm²+72√2cm²
Pc=36(1+2√2)cm²