[tex]a=6cm\\b=9cm\\\\Pp=a^2=36cm^2\\\\h - \text{ wysokosc sciany bocznej }\\(\frac12a)^2+h^2=b^2\\9cm^2+h^2=81cm^2 /-9cm^2\\h^2=72cm^2\\h^2=\sqrt{9*4*2}cm=3*2\sqrt2cm=6\sqrt2cm\\\\Pb=\frac{ah}2\\Pb=\frac{6cm*6\sqrt2cm}2=18\sqrt2cm^2\\\\Pc=Pp+4Pb\\Pc=36cm^2+4*18\sqrt2cm^2=36cm^2+72\sqrt2cm^2=36(1+2\sqrt2)cm^2[/tex]
