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P=6*a*a
P=6*2.5cm*2,5cm
P=6*6,25cm2
P=37,5cm2
b)
Pp=2cm*4cm=8cm2
Pb=2*4cm*6cm+2*2cm*6cm=2*24cm2+2*12cm2=48cm2+24cm2=72cm2
Pc=2*8cm2+72cm2=16cm2+72cm2=88cm2