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弧的概念在数学中有一定位置,但长期以来,未能用恰当的数学符号来区分弧的度数和弧的长度。例如:是表示弧的度数呢?还是
The concept of arc has a certain position in mathematics, but for a long time, it has not been possible to distinguish the degree of arc and the length of the arc with proper mathematical symbols. For example: is it the degree of the arc?