1 . 如图,直线
与圆切于点
,过
作直线与圆交于
两点,点
在圆上,且
.
![](https://img.xkw.com/dksih/QBM/2016/11/3/1573111429447680/1573111435993088/STEM/f90ae4f52cef411aa76787b279f46c88.png?resizew=185)
(1)求证:
;
(2)若
,求
.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/bd33764ff4efddfe11a98a609753715c.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5963abe8f421bd99a2aaa94831a951e9.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/dad2a36927223bd70f426ba06aea4b45.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/39acab3cfb59bfc9591371721ab01d93.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7f9e8449aad35c5d840a3395ea86df6d.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/8b70faeb8cf6c8bdb9aab3a006b4c974.png)
![](https://img.xkw.com/dksih/QBM/2016/11/3/1573111429447680/1573111435993088/STEM/f90ae4f52cef411aa76787b279f46c88.png?resizew=185)
(1)求证:
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b0debf7dd6e6a8fd14253cb1a4a3bc59.png)
(2)若
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/8edaed541a0f4ec6c8c7f22f37639796.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/4e0a538a73dd30cfcb47455e37bfb4cc.png)
您最近一年使用:0次
2016-12-04更新
|
390次组卷
|
5卷引用:2017届河南商丘第一高级中学年高三上理开学摸底数学试卷
2 . 如图所示,
为
的切线,切点为
,割线
过圆心
,且
.
![](https://img.xkw.com/dksih/QBM/2016/9/20/1573033401475072/1573033407840256/STEM/a129a3a0802140398967f3b5590c5353.png)
(Ⅰ)求证:
;
(Ⅱ)若
,求
的长.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7a5f1641947153c80b987320885a2b57.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/880be04496b4e06b1c47d433d880b442.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/acc290b44635265137fdf13146b6a6d9.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9d246f9eceab371ebf47a47c2f11a4ad.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/1dde8112e8eb968fd042418dd632759e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/6c5c1f5b997325ff92274249b136b6fc.png)
![](https://img.xkw.com/dksih/QBM/2016/9/20/1573033401475072/1573033407840256/STEM/a129a3a0802140398967f3b5590c5353.png)
(Ⅰ)求证:
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/13a53295a15ca303b296d02ceb24b2fa.png)
(Ⅱ)若
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b3a07fe4bce9ed14540523de48736920.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/4fb26d84907c923278ac4626a9d58947.png)
您最近一年使用:0次
2016-12-04更新
|
108次组卷
|
5卷引用:2017届河南息县第一高级中学高三上段测三试数学(理)试卷
3 . 选修4-1:几何证明选讲
如图,已知圆O是
的外接圆,
,AD是BC边上的高,AE是圆O的直径.过点C作圆O的切线交BA的延长线于点F.
![](https://img.xkw.com/dksih/QBM/2015/5/11/1572097330028544/1572097336180736/STEM/934d2e7809ef4381ba632b630e36e822.png?resizew=185)
(1)求证:
;
(2)若
,
,求AE的长.
如图,已知圆O是
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/15c0dbe3c080c4c4636c64803e5c1f76.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/3570a95f68349fcd9417fcda62e78e7e.png)
![](https://img.xkw.com/dksih/QBM/2015/5/11/1572097330028544/1572097336180736/STEM/934d2e7809ef4381ba632b630e36e822.png?resizew=185)
(1)求证:
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/4ed8f57d66aae0f646879f7b41bf0343.png)
(2)若
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/bbc39144b305c67d44410d41053a1d28.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/3da8046ae7d118efabe9e2fbadcfe92d.png)
您最近一年使用:0次
2016-12-03更新
|
595次组卷
|
9卷引用:2017届河南郑州一中网校高三入学测试数学(理)试卷
13-14高三·河南·开学考试
4 . 选修4-l:几何证明选讲在
ABC中,D是AB边上一点,
ACD的外接圆交BC于点E,AB= 2BE
![](https://img.xkw.com/dksih/QBM/2015/3/17/1572012135563264/1572012141420544/STEM/db089ab32f6d45a8b1f04385491c8a0d.png)
(1)求证:BC= 2BD;
(2)若CD平分
ACB,且AC =2,EC =1,求BD的长
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/8e033f67841bcb481db65d3ce495f0b6.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/8e033f67841bcb481db65d3ce495f0b6.png)
![](https://img.xkw.com/dksih/QBM/2015/3/17/1572012135563264/1572012141420544/STEM/db089ab32f6d45a8b1f04385491c8a0d.png)
(1)求证:BC= 2BD;
(2)若CD平分
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ff522636907ba2f6cbcbc1f443d6e05b.png)
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2016-12-03更新
|
437次组卷
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5卷引用:2015届河南省顶级名校高三入学定位考试文科数学试卷
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