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a)
P=2*4*4+2*4*7+2*4*7=32+56+56=144 cm²
b)
P=2*3*2+2*3*5+2*2*5=12+30+20=62 m²
b) Pc = 2*(3*2 + 3*5 + 2*5)= 2*31 = 62 m²