a=2 dm=20 cm
b=7 cm
c=15 cm
Pc=2ab+2ac+2bc
Pc=2·20·7+2·20·15+2·7·15
Pc=280+600+210
Pc=1090 cm²
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a=2 dm=20 cm
b=7 cm
c=15 cm
Pc=2ab+2ac+2bc
Pc=2·20·7+2·20·15+2·7·15
Pc=280+600+210
Pc=1090 cm²