为什么一道几何题不添加辅助线就做不出来，添加了才做的出来，添加辅助线后多了条件吗知乎 Sketch Coloring Page

为什么一道几何题不添加辅助线就做不出来，添加了才做的出来，添加辅助线后多了条件吗知乎 Template

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