题目如图,AB,AB,AB∥CD,CD,CD,有图中α\alphaα,β\betaβ,γ\gammaγ三角之间的关系是（ ）A.α+β+γ=180∘\alpha +\beta +\gamma =180^{\circ}α+β+γ=180∘B.α−β+γ=180∘\alpha -\beta +\gamma =180^{\circ}α−β+γ=180∘C.α+β−γ=180∘\alpha +\beta -\gamma =180^{\circ}α+β−γ=180∘D.α+β+γ=360∘\alpha +\beta +\gamma =360^{\circ}α+β+γ=360∘知识点：余角和补角章节：图形的性质 / 图形认识初步
