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l=39,56
l=2πr
r=l/2π = 39,56/2π=19,78π
P=19,78 ² π ≈391π
O= 2 pi x 19,78
O= 39,56 pi (cm)
P= pi r^2
P= pi 19,78^2
P= 391,25 (cm^2)
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