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直线和圆相切是圆这一章的重点,也是历年中考所要考查的重要内容之一,要掌握有关切线的几个重要知识,从而掌握解决有关切线问题的方法和技能技巧,提高分析问题、解决问题的能力。 本文就有关切线的几个知识点及在解题中的运用加以探讨。 例1.如图,已知△ABC内接于⊙O,AD是△ABC的高,⊙O的直径AE交BC于F,点P在BC的延长线上,且∠CAP=∠B。
The tangency of the straight line and the circle is the focus of this chapter. It is also one of the important contents to be examined in the senior high school entrance examination. It is necessary to acquire several important knowledge about the tangent line, so as to master the methods and skills to solve the tangent problem, and to improve the analysis problem. Ability to solve problems. This article discusses several lines of knowledge about the line and its use in problem solving. Example 1. As shown in the figure, it is known that △ABC is inscribed in ⊙O, AD is high in ΔABC, ⊙O is the diameter ΔE that intersects BC in F, point P is in the extension line of BC, and ∠ CAP = ∠B.