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4α+20°=360°
4α=360°-20°
4α=340° /:4
α=85°
α+10°=85°+10°=95°
II kąt - x
III kąt - x+10
IV kąt - x+10
x+x+x+10+x+10 = 360
4x+20 = 360
4x = 360-20
4x = 340:4
x = 85
I kąt - 85
II kąt - 85
III kąt - 85+10 = 95
IV kąt- 85+10 = 95
α+10=β
2α+2β=360
α-β=-10 / *2
2α+2β=360
2α-2β=-20
4α=340
α=85 st.
β=α+10=85+10=95 st.