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b=3,5cm
c=8cm
Pc=2ab+2ac+2bc
Pc=2*5*3,5+2*5*8+2*3,5*8
Pc= 35+ 80+56
Pc= 171 cm²
b) a=1,2 dm=12cm
b=15cm
c=0,2m=20cm
Pc= 2ab+2ac+2bc
Pc= 2*12*15+2*12*20+2*15*20
Pc=360+480+600
Pc=1440 cm²