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x =(απ)/180 =(120π)/180=(12π)/18=(6π)/9=(2π)/3=(2/3)*π (miara łukowa)
r=12
Długość łuku
l=x*r=(2/3)*π*12=(24/3)*π=8π
Pole wycinka
P=(x/2)*r²=[(2/3)*π]:2 *12²=(1/3)*π*144=(144/3)*π=48π
Obw=2π*12 =24π
czesc kola = 120/360 -> 1/3
1/3 * 24π = 8π -> dlugosc luku
Pole luku:
P=π12²=144π
pole zacieniowanego = 144π * 1/3 = 48π
Pozdrawiam! :)