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Pp=(a+b)h /2
Pp=2*(28+56)*25 /2 =2100 cm²
Pb1=28,6*10=286cm²
Pb2=28*10=280cm²
Pb3=28,6*10=286cm²
Pb4=56*10=560cm²
Pc=286+280+286+560+2100 = 3512cm²