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0=2*pi*r
2*3,14*r=18.84
6,28*r=18.84 /:6,28
r= 3 m
P= pi*r2
P=3,14*3^2
P=3,14*9
P=28,26 m2
18,84 = 2πr
π≈3,14
6,28r=18.84
r=3 m
P=πr²
P=3,14*3²
P=3,14*9
P=28,26m²