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suma katów ostrych=90⁰
α=jeden z katów ostrych
90-α= drugi katy ostry
α=¼(90+90-α)
α=45-¼α
α+¼α=45
⁵/₄α=45
α=45:⁵/₄
α=36⁰
90-36=54⁰
katy Δ:90,36 i 54⁰