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πr² = Pk (pole koła)
r = 10
Pk = πr² = π×10² = 100π
Pw = 25π
Pk × α/360° = Pw
Pk × α = Pw × 360°
α = Pw × 360° ÷ Pk
α = 25π × 360° ÷ 100π
α = 360° ÷ 4
α = 90°