P=πr²
49π=πr²/:π
r²=49
r=7cm
L=2πr=2·7π=14πcm≈43,96cm π≈3,14
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P=πr²
49π=πr²/:π
r²=49
r=7cm
L=2πr=2·7π=14πcm≈43,96cm π≈3,14