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a)
pc = 2*20 +2*150 + 2*30
pc = 40+300+60 = 400 cm^2
b)
pc=2*9+2*13+2*29,25
pc= 18+26+58,5
pc = 102,5 cm^2
c)
pc= 2*18+ 2*33 + 2*16,5
pc= 36+66 + 33
pc = 135 cm^2