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2=πr²/360 *α |:(πr²/360)
α=2/(πr²/360)
α=2*(360/πr²)
α≈720/(3,14*9)
α≈720/28,26≈25,5
Pw=α/360*Πr²
α/360*Πr²=2
α/2Π *Π9=2
α*Π9=2*2Π
9αΠ=4Π
α=4/9