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Pw= α/360⁰ ·πr²
12π = 120/360 ·πr² /:π
12 = 1/3 ·r² /·3
36=r²
r=6
Lw= α/360 ·2πr
Lw = 1/3 ·2π·6
Lw=1/3·12π=4π
Odp. Długość łuku wynosi 4π