P=πr^2
0,04π=πr^2
r^2=0,04
r=0,2 dm
π=πr^2
r^2=1
r=1 km
9/16π=πr^2
r^2=9/16
r=3/4mm
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P=πr^2
0,04π=πr^2
r^2=0,04
r=0,2 dm
π=πr^2
r^2=1
r=1 km
9/16π=πr^2
r^2=9/16
r=3/4mm