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Obw=9,42m
Obw=2*Pi*r
9,42=2*3,14*r
9,42=6,28r
6,28r=9,42/:6,28
r=1,5m
r drzewa= 1,5m - 1m = 0,5m
r=0,5m
średnica
d=2r
d=2*0,5m
d=1m
Odp: średnica pnia drzewa wynosi 1m