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r=2
pole = 4π
obwód = 4π
r=1/3
pole = 1/9π
obwód=2/3 π
r=√5
pole=5π
obwód=2√5π
r=2π
pole = 4π³
obwód=4π²
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d=6
r=3
pole = 9π
obw.=9π
d=1
r=1/2
pole=1/4π
obw.=π
d=√2
r=1/2√2
plle= 1/2π
obwód=√2π
d=π
r=1/2π
pole= 1/4π³
obwód= π²