a=13cm
P=208cm²
P=a·b /:a
P:a=b
b=208cm²:13cm=16cm
208 cm2 - pole prostokąta
13cm-jeden bok
208:13=16-drugi bok
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a=13cm
P=208cm²
P=a·b /:a
P:a=b
b=208cm²:13cm=16cm
208 cm2 - pole prostokąta
13cm-jeden bok
208:13=16-drugi bok