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43 = 2r / 2
21,5 = r
P = π21,5 ² = 462,25π [j.²]
r = 21,5
πr(do kwadratu) = π * 21,5(do kwadratu) = 642,25
43π=2πr-obie strony dzielimy przez π
43=2r
r=21,5m
P=πr²
P=π(21,5m)²
P=462,25πm²