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16/2=8-krótszy bok prostokąta
xd
a=12cm
b=?
wzór na obwód:
ob.=2*a+2*b
40cm=2*12cm+2*b
40cm=24cm+2b
2b=40cm-24cm
2b=16cm/:2
b=8cm
odp.drugi bok ma 8cm
a-dłuższy bok
b-krótszy bok
[40-(2*12)]:2=16:2=8cm