a=10cm
b=17cm
Pp=a²=10²=100cm²
Pb=4ab=4·10·17=680cm²
Pc=2Pp+pb=2·100+680=200+680=880cm²
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a=10cm
b=17cm
Pp=a²=10²=100cm²
Pb=4ab=4·10·17=680cm²
Pc=2Pp+pb=2·100+680=200+680=880cm²