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在平面几何中,有“同弧所对的圆周角大于圆外角”的定理,在解几中,这个定理可引申为:如图1,M为x轴的正半轴上
In the plane geometry, there is a theorem that the angle of the circle with the same arc is greater than the angle of the circle. In the solution, the theorem can be extended as follows: As shown in Figure 1, M is the positive axis of the x-axis.