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In the figure, line AP and PC are tangent to the circle at points A and C, respectively. Point O is the center of the circle, and the length of the line segment PO is 4. If the measure of angle APC is 60 degrees, what is the length of arc ABC?
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· 相关考点
4.5.7 圆与切线
4.5.7 圆与切线
以上解析由 考满分老师提供。