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α= 1/2 (90*+β)
α= 45*+1/2β
α= 45*+ 1/2 (90*-α)
α= 45*+45*-1/2α
1,5α=90*
α=60*
β=90*-60*
β=30*
Kąty mają miary 90*, 60* i 30*.