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60=2x
x=30 cm
60 :2=30
odp; drugi bok ma długości 30 cm.
bok a = 40cm
2 bok a =40cm
bok b = 140-(2x40cm)/ 2= 30cm
2 bok b = 30 cm
sprawdzenie 40cm+40cm+30cm+30cm= 140 cm