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2πr=314 cm
r=314:2π=157π
średnica=2r
2r=157π*2=314π=314*3,14=985,96 cm
Odp. średnica pnia drzewa wynosi ok. 986 cm
l=31,4 dm
l=πd
31,4=πd
31,4≈3.14*d /:3.14
d=10 dm
Odp.:Średnica drzewa wynosi ok 10 dm.