有三角形abc，其内部包含一条端点为b、c的光�凸曲线，如何证明曲线的长度小于三角形剩余两边之和？ 知乎 Sketch Coloring Page

有三角形abc，其内部包含一条端点为b、c的光�凸曲线，如何证明曲线的长度小于三角形剩余两边之和？ 知乎 Template

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