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Pb(boczne)=2Pp(podstawy)
Pp=x
Pc=Pb+pp
56√2= 2x+x
56√2=3x /:3
18,7√2=x
Pb=2*18,7√2
Pb=37,4√2
Pole 1 ścianki wynosi:
37,4√2:4=9,35√2