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在解决共顶点的等线段或90°的特殊角或共边的等角的相关问题时,可以构造辅助圆,利用圆的知识来解决,能达到出奇制胜的效果.
Auxiliary circles can be constructed to solve the problem of equiaxes of common vertices or special angles or common angles of 90 °. Using the knowledge of circles, we can achieve the surprising success.