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r>0
P=πr²
4π=πr²
r=2cm
Ob=2πr
Ob=4πcm
4πcm²=πr² /:π
r²=4
r=√4
r=2cm
obwód koła = 2πr=2π×2cm=4πcm
odp. obwód koła wynosi 4πcm.
p=4πcm²
πr²=4πcm²/:π
r²=4cm² /√
r=2cm
obw=2πr
obw=2π*2
obw=4π