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圆的切线是初中几何的重点内容之一.圆与切线以及由它拓展出来的图形千变万化,从而也产生了许多结论,正如许多事物一样,它们
The tangent of the circle is one of the key contents of the geometry of junior high school. The circles and tangents and the graphics extended by it are ever-changing, which has led to many conclusions. Just like many things, they