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P=πr²
L=2πr
r=3
P=π3²=9π
L=2π3=6π
1/2
P=π1/2²=1/4π
L=2π1/2=1π
r=1/2√2
P=π1/2√2²=1/2π
L=2π1/2√2=√2π
r=1/2 π
P=π π²=π³
L=2ππ=2π²