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判定圆的切线是初中数学的一个重要内容.同学们在学习时一定要扎实掌握切线的判定.下面就和同学们谈谈判定圆切线的二、五法则,请同学们学习时加以借鉴.
Judge the tangent of the circle is an important part of junior high school mathematics .Students must learn a solid grasp of the tangential decision .To talk with the students to determine the two or five rules of round cut line, please learn from the students to learn from.