圆心角




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角AOB为圆O的圆心角


圆心角，指顶点在圆心上的角，因为顶点在圆心上，所以角的两边与圆的半径共直线。[1]



定理


圆周角为圆心角的½.vv



延伸阅读


  • 圆周角


参考资料



  1. ^ 人民教育出版社九年级上册数学书


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