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α = (90⁰ + β)/2 /*2
α + β = 90⁰
2α = 90⁰ + β
α + β = 90⁰
2α - β = 90⁰
3α = 180⁰ /:3
α = 60⁰
β = 30⁰
Miary kątów: 30, 60 i 90 st.