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920m: 2 = 460m
drugi bok-x+20
Obw=a*2+b*2
x*2+(x+20)*2=960
2x+2x+40=920 |-40
4x=900 |/4
x=230
pierwszy bok ma 230m
drugi bok ma 230m+20m=250m
2x+2(x+20)=960
2x+2x+40=960
4x=960-40
4x=920 /4
x=230
x+20= 230+20=250