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P=6πr²
6πr² =1350π /:6π
r² =225
r=√225
r=15cm
d=2r
d=2*15
ds=30cm średnica serwetki
do=2m
do=200cm średnica obrusa
do/ds =k =200/30 =20/3 skala podobieństwa obrus/seretka
ds/do =1/k =3/20 skala podobieństwa seretka/obrus
Skala podobieństwa obrusa do serwetki: