真题
1 . 证明:如图,
是圆O的直径,
是圆O的切线,切点为B,
平行于弦
,求证:
是圆O的切线.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f52a58fbaf4fea03567e88a9f0f6e37e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/6b1bd1adfe4cc6566218f19970c2fd3b.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/828628c0876b45381c9a0edeb0fec236.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/03902478df1a55bc99703210bccab910.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9e52a8f07834cbbbe4224962672fbbb2.png)
![](https://img.xkw.com/dksih/QBM/editorImg/2022/11/9/483a5d01-63c2-4101-9618-f9b637a889eb.png?resizew=137)
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真题
解题方法
2 . 证明:
.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/acace611d1e6a5d4b23cc2c13e567f3b.png)
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真题
3 . 如图,
为圆的直径,P、C为圆上两点,连
,过C作
的垂线与
和
的延长线依次相交于A,B,D,求证:
.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/411461db15ee8086332c531e086c40c7.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2ec8858389f4c3156a946ba8bf0d8a7b.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/411461db15ee8086332c531e086c40c7.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2dbbb13ac6a4773193f76ab21be9fbba.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5845ffc7d1af9053b027cf9e726f5367.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/098f2d934743e32a3668dd5e612716e3.png)
![](https://img.xkw.com/dksih/QBM/2022/11/7/3104399415574528/3104527860924416/STEM/4c16330b778e42d49a67369025ac878e.png?resizew=159)
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