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r - promień
α - kąt środkowy
r = 12 cm
α = 30°
ł = α/360° × 2πr
ł = 30°/360° × 2 × π × 12
ł = 1/12 ×24×π
ł = 2π
l=30:360*2π*12cm
l=1:12*24π
l=2π
l=2*3,14=6.28