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α, β - kąty z osią OX
a₁ = 1/√3 * √3/√3 = √3/3 ⇒ tgα ⇒30°
a₂ = -1 ⇒ tgβ = -1 ⇒ β = -45°
γ = α - β = 30° - (-45°) = 30° + 45° = 75°
γ = 75⁰
b)
a₁ = √3 ⇒ tgα ⇒ 60°
a₂ = -√3 ⇒ tgβ = -60°
γ = α - β = 60° - (-60°) = 60° + 60° = 120°
γ = 120°
c)
a₁ = √2
a₂= -1/√2
a₁ * a₂ = √2 * (-1/√2) = -1 - warunek prostopadłosci prostych
α - β = 90°
γ = 90⁰