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Obwód 16 pi
P= pi 8²
P=64 pi
L=2 pi r
L=2 pi 8
L=16 pi
średnica-2r
r-promień
r=8;2=4cm
Obw=2pi*r
Obw=2*pi*4
Obw=8pi
Obw=8*3,14
Obw=25,12 cm
P=pi*r²
P=pi*4²
P=pi*16
P=3,14*16
P=50,24cm²