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H=12cm
Pc=2Pp+Pb
Pp=a²
Pp=(7cm)²
Pp=49cm²
Pb=4 x (a x H)
Pb=4 x (7cm x 12cm)
Pb=4 x 84cm²
Pb= 336cm²
Pc= 2 x 49cm² + 336cm²
Pc= 98cm² + 336cm²
Pc= 434cm²