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Ob=2a+2b
a=10
b=?
36=2*10+2b
36=20+2b
2b=36-20
2b=16 / :2
b=8
krótszy bok ma 8 cm
proste!!! 10x2=20 36-20=16 16 podzielić 2= 8 czyli krótszy bok ma 8 cm