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Pp = (6 * 8) / 2
Pp = 24 cm²
Pb = 6 * 9 + 8 * 9 + 10 * 9
Pb=216 cm²
Pc = 2 * 24 + 216
Pc=264 cm²
2.
Pp= ((7+13) * 4) / 2
Pp=40 cm²
Pb= 5 * 12 + 5 * 12 + 7 * 12 + 13 * 12
Pb=360 cm²
Pc = 2 * 40 + 360
Pc=440 cm²