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r^2=16 / pierwiastkujemy
r=4
obwód:
2pir
2pi4=8picm
16=r²
r=√16
r=4cm
obwód=2πr
ob=2π*4
ob=8πcm
16=r^2
r=√16
r=4cm
obwód=2πr
ob=2π*4
ob=8πcm