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l = 2 (pi) x 2,5
l = 5 (pi)
Odp. B
jeśli tak to to jest roziwązanie
r=2 1/2
r=5/2
2pi R = obw
2×5/2×PI
obw = 10/2×pi
obw=5PI
l=2(pi)*2,5
l=5(pi)
Odpowiedz b