如图,
是
的直径,点D在
的延长线上,C为
上的一点,
,
.
![](https://img.xkw.com/dksih/QBM/editorImg/2023/1/3/6fd8b772-342b-48c1-9675-a8283d89b1fd.png?resizew=161)
(1)求
的度数;
(2)求证:
是
的切线.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f52a58fbaf4fea03567e88a9f0f6e37e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/3d97cdc586744d208b6f69c9813af977.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f52a58fbaf4fea03567e88a9f0f6e37e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/3d97cdc586744d208b6f69c9813af977.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0c9667032ec704927b9a3dcd2d73e6ad.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/37a9d4526ddf01eb414b7257661799b9.png)
![](https://img.xkw.com/dksih/QBM/editorImg/2023/1/3/6fd8b772-342b-48c1-9675-a8283d89b1fd.png?resizew=161)
(1)求
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/8bf7a961a55aa7f225fadb6a25a60c75.png)
(2)求证:
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9e52a8f07834cbbbe4224962672fbbb2.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/3d97cdc586744d208b6f69c9813af977.png)
22-23九年级上·广东广州·期末 查看更多[2]
更新时间:2023-01-01 21:21:16
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解答题-证明题
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【推荐1】如图所示,在正方形
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名校
【推荐2】已知:如图,
是
的角平分线,过点D分别作
和
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于点E,交
于点F.
是菱形;
(2)若
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![](https://staticzujuan.xkw.com/quesimg/Upload/formula/03902478df1a55bc99703210bccab910.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/15c0dbe3c080c4c4636c64803e5c1f76.png)
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(2)若
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c63c964704fc18da9d0f921906bf2ea8.png)
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【推荐1】如图,⊙O的直径AB垂直于弦CD,垂足为E,
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【推荐2】如图,BD为⊙O的直径,AB=AC,AD交BC于点E,AE=2,ED=4.
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(1)判断△ABE与△ADB是否相似,并说明理由;
(2)求AB的长.
(3)求
的正切值;
![](https://img.xkw.com/dksih/QBM/2016/1/20/1573958147358720/1573958153732096/STEM/ec8d0364ca9d4da39888f86431c5b6f3.png)
(1)判断△ABE与△ADB是否相似,并说明理由;
(2)求AB的长.
(3)求
![](https://img.xkw.com/dksih/QBM/2016/1/20/1573958147358720/1573958153732096/STEM/2a236d2a844d4d72bdbff98e8ee22f44.png)
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解题方法
【推荐1】已知:如图,
是
的直径,
是
的弦,点
是
外一点,![](https://staticzujuan.xkw.com/quesimg/Upload/formula/3452f3e430d7db2c72a990c0a09fb2d8.png)
![](https://img.xkw.com/dksih/QBM/2020/7/12/2504268936060928/2504386812895232/STEM/f47ddf2c009141d79bcc41bb5cca7c48.png?resizew=212)
求证:
是
的切线.
若
,且
求
的半径.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f52a58fbaf4fea03567e88a9f0f6e37e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/3d97cdc586744d208b6f69c9813af977.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0dc5c9827dfd0be5a9c85962d6ccbfb1.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/3d97cdc586744d208b6f69c9813af977.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/8455657dde27aabe6adb7b188e031c11.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/3d97cdc586744d208b6f69c9813af977.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/3452f3e430d7db2c72a990c0a09fb2d8.png)
![](https://img.xkw.com/dksih/QBM/2020/7/12/2504268936060928/2504386812895232/STEM/f47ddf2c009141d79bcc41bb5cca7c48.png?resizew=212)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9bf6c84731e5e1bd335ecfc2d36c3d81.png)
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![](https://staticzujuan.xkw.com/quesimg/Upload/formula/3d97cdc586744d208b6f69c9813af977.png)
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【推荐2】如图,已知A、B、C、D、E是
上五点,
的直径
,
,A为
的中点,延长BA到点P,使
,连接PE.
![](https://img.xkw.com/dksih/QBM/editorImg/2022/10/14/46186cd5-f5dc-42a4-8255-4dd2d9ae334c.png?resizew=156)
(1)求线段BD的长;
(2)求证:直线PE是
的切线;
(3)连接OP,求
的值.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/3d97cdc586744d208b6f69c9813af977.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/3d97cdc586744d208b6f69c9813af977.png)
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![](https://img.xkw.com/dksih/QBM/editorImg/2022/10/14/46186cd5-f5dc-42a4-8255-4dd2d9ae334c.png?resizew=156)
(1)求线段BD的长;
(2)求证:直线PE是
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/3d97cdc586744d208b6f69c9813af977.png)
(3)连接OP,求
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/33a8fe733b02d943732f3cf2662da13e.png)
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