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数学大师：弧、弦和圆心角
圆形场景最主要的特点是视觉角度大， 我们可以在更大的视觉范围内看到更高质量的显示内容。 我们把顶点在圆心的角叫做圆心角。 那么圆心角有什么特别之处呢？
初三数学重点知识导入13/28
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