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B=x
C=1/2(x+90)
A+B+C=180
90+x+1/2x+45=180
3/2x=180-135
3/2x=45
x=30
A=90 stopni
B=x=30 stopni
C=1/2(x+90)=1/2(30+90)=1/2*120=60 stopni
A+B+C=90+30+60=180 stopni
x - szukany kąt
90-x - drugi kąt ostry
2x=90+(90-x)
2x=90+90-x
3x=180 \:3
x=60 jeden kąt ostry
90-x=30 drugi kąt ostry
spr: 90 +60 + 30=180
β = ½ × (90° + γ)
α + β + γ = 180°
β = 45° + ½γ
β = 90° - γ
45° + ½γ = 90° - γ
1,5γ = 45°
γ = 30°
β = 60°
α = 90°
α + β + γ = 90° + 60° + 30° = 180°