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a = 8
b = 5
c = 12
Pc = 2(40+96+60)
Pc = 2*196
Pc = 392 cm²
b) Pc = 2(ab + ac + bc)
a = 3√2
b = 4√2
c = 5√2
Pc = 2(24+30+40)
pc = 2*94
Pc = 188 cm²