Pb=611cm^2
Pc=900cm^2
Pp=Pc-Pb
Pp=900-611
Pp=289cm^2
Pp=a^2
a^2=289
a=17cm krawędz podstawy
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Pb=611cm^2
Pc=900cm^2
Pp=Pc-Pb
Pp=900-611
Pp=289cm^2
Pp=a^2
a^2=289
a=17cm krawędz podstawy