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πr=31,4/3,14 czyli π
r= 10
r=62,8/2*3,14
r=10
P=πr² = 3,14* 10²=314cm²
l=2πr
π = 3,14
62,8 = 2*3,14*r
62,8=6,28r//:6,28
r=10