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现行初中数学课本《几何》第二册的5·7节中由直线和圆的位置关系的定理的(2)—圆心到直线的距离等于半径时直线和圆相切〔以下简称定理(2)〕,引出了切线的判定定理——经过
In the current junior middle school mathematics textbook “Geometry”, Section 5.7 of the second book, the theorem of the relationship between the straight line and the circle (2) - the distance from the center to the straight line is equal to the radius, the line is tangent to the circle (hereinafter abbreviated as Theorem (2) ], leads to the tangent decision theorem - after