怎样证明三角形的内角和是180度?急需!!!今天要!!!
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![怎样证明三角形的内角和是180度?急需!!!今天要!!!](/uploads/image/z/1004908-4-8.jpg?t=%E6%80%8E%E6%A0%B7%E8%AF%81%E6%98%8E%E4%B8%89%E8%A7%92%E5%BD%A2%E7%9A%84%E5%86%85%E8%A7%92%E5%92%8C%E6%98%AF180%E5%BA%A6%3F%E6%80%A5%E9%9C%80%21%21%21%E4%BB%8A%E5%A4%A9%E8%A6%81%21%21%21)
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