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a=2,5cm+2,5cm=5cm
b=2,5cm+2,5cm+2,5cm=7,5cm
P=5cm*7,5cm=37,5cm2
b) P=a*b
a=4m+4m=8m
b=4m
P=8m*4m=32m2
*- znak mnożenia
na pewno dobrze,liczę na naj! :DD