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O=2*pi*r
d=2r średnica
O=d*pi
d*pi=59
d=59/pi cm srednica
pi=3,14
d=59:3,14=18,8cm średnica
r= 29,5 /pi
2r=S
S=59 / pi cm
pi= 3,14(ok)
S=59 / 3,14= 18,8cm
Odp.Średnica ma długosć 18,8cm