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a=25dm
b=25 dm * 0,2=5dm
Obw= 2*a+2*b= 2*25+2*5=50+10=60 dm
Kwadrat
Obw= 4*a
60 dm=4*a
a=60:4=15 dm
P=a8a=15*15=225 dm^2
Odp. Pole kwadratu wynosi 225 dm^2.