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L=TTd/TT
d=L:TT
d=157:3,14
d=50
r - promień
l - średnica
l = 2r
π≈3,14
2*3,14*r = 157 /:2
3,14*r = 78,5 /:3,14
r=25
l=2*25
l=50
Odp: Drzewo ma średnicę 50cm.