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2πr=4π
r=2cm
P=πr²
P=π*2²=4πcm²
odp.pole to 4πcm²
czyli 2πr=4π cm
skad r=4π/2π
r=2 cm
pole kola ma wzor
P=πr²
P=π 2²=4π=12,56 cm²
czyli podstawiamy
4π=2π*r
r=2
do wzoru na Pole koła podstawiamy
P=π*r²=4π