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b=12
c=75% z 12=9
75/100*12=9
V=5*12*9=540
H=krawedzi bocznej
H=9
V=5*12*9=540
Pc=2ab+2bH+2aH
Pc=2*5*12+2*12*9+2*5*9=120+216+90=426[cm]