真题
1 . 选修4—1:几何证明选讲 如图,直线AB为圆的切线,切点为B,点C在圆上,∠ABC的角平分线BE交圆于点E,DB垂直BE交圆于D.
![](https://img.xkw.com/dksih/QBM/editorImg/2022/12/1/5365865e-1cc9-47a2-9e47-f3464ca9a3c5.png?resizew=160)
(Ⅰ)证明:DB=DC;
(Ⅱ)设圆的半径为1,BC=
,延长CE交AB于点F,求△BCF外接圆的半径.
![](https://img.xkw.com/dksih/QBM/editorImg/2022/12/1/5365865e-1cc9-47a2-9e47-f3464ca9a3c5.png?resizew=160)
(Ⅰ)证明:DB=DC;
(Ⅱ)设圆的半径为1,BC=
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a7ffe8515ff6183c1c7775dc6f94bdb8.png)
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2 . 选修4-1:几何证明选讲
如图,
切圆
于点
,直线
交圆
于
两点,
,垂足为
.
![](https://img.xkw.com/dksih/QBM/2016/6/22/1572787387006976/1572787393445888/STEM/9599c56d4f2b4e22956f984f1a401b23.png)
(1)证明:
;
(2)若
,求圆
的直径.
如图,
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f52a58fbaf4fea03567e88a9f0f6e37e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/1dde8112e8eb968fd042418dd632759e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7f9e8449aad35c5d840a3395ea86df6d.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e2c3d2cba96f6f03520c0b3f6e4da03e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/1dde8112e8eb968fd042418dd632759e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/91e1e4115d78e625e9e0f47cdade3286.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/71deef18df0a35ef131b5653aa0b0202.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c5db41a1f31d6baee7c69990811edb9f.png)
![](https://img.xkw.com/dksih/QBM/2016/6/22/1572787387006976/1572787393445888/STEM/9599c56d4f2b4e22956f984f1a401b23.png)
(1)证明:
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/174a0e72f870185f91bd78c85b86c916.png)
(2)若
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/cd1bf599d552b188147e008a05b7d08a.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/1dde8112e8eb968fd042418dd632759e.png)
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2016-12-04更新
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3 . 选修4—1:几何证明选讲
如图,已知
切⊙
于点
,割线
交⊙
于
、
两点,
的平分线和
、
分别交于点
、
.求证:
![](https://img.xkw.com/dksih/QBM/2015/4/13/1572067092578304/1572067098755072/STEM/940910ba322b40e4a8801e4957bc638c.png)
(1)
;
(2)
.
如图,已知
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/fc5adb5eb60ae4435a12d93854066298.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/1dde8112e8eb968fd042418dd632759e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2a30f3a8b673cc28bd90c50cf1a35281.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/4a0cbbcc3d79bf999588882e7b1b4324.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/1dde8112e8eb968fd042418dd632759e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5963abe8f421bd99a2aaa94831a951e9.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7f9e8449aad35c5d840a3395ea86df6d.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/3095fff5c74820dc2c8f203290543441.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/68a83fdd2ba72a2dba0b6b10bb3e06b9.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/85c4bdfb0db1e31e8459df1d15f9ab55.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c5db41a1f31d6baee7c69990811edb9f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/8455657dde27aabe6adb7b188e031c11.png)
![](https://img.xkw.com/dksih/QBM/2015/4/13/1572067092578304/1572067098755072/STEM/940910ba322b40e4a8801e4957bc638c.png)
(1)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/686171942bd7698035016c732db43b63.png)
(2)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/42085f2e3c3a832ea376943aebb09031.png)
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2卷引用:2015届甘肃省兰州市高三诊断考试理科数学试卷
2014·甘肃兰州·一模
4 . 如图,已知
切⊙
于点
,割线
交⊙
于
两点,∠
的平分线和
分别交于点
.
求证:(1)
; (2)![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b9d52494a2d4fdfe7071f89583c51d89.png)
![](https://img.xkw.com/dksih/QBM/2014/7/8/1571815473430528/1571815479418880/STEM/90ac746e57c24e56ac8bba93e5b58f0a.png)
![](https://img.xkw.com/dksih/QBM/2014/7/8/1571815473430528/1571815479418880/STEM/fa992c354d3d44e58bd6c5b1e6a0867b.png)
![](https://img.xkw.com/dksih/QBM/2014/7/8/1571815473430528/1571815479418880/STEM/eabcb17a1628440ba230c151c9b0f651.png)
![](https://img.xkw.com/dksih/QBM/2014/7/8/1571815473430528/1571815479418880/STEM/6112bf5fd3944094b7ca6c5622ddb15a.png)
![](https://img.xkw.com/dksih/QBM/2014/7/8/1571815473430528/1571815479418880/STEM/fa992c354d3d44e58bd6c5b1e6a0867b.png)
![](https://img.xkw.com/dksih/QBM/2014/7/8/1571815473430528/1571815479418880/STEM/6d67c6b701dc4bb592c6b1c7beb2782a.png)
![](https://img.xkw.com/dksih/QBM/2014/7/8/1571815473430528/1571815479418880/STEM/f9d21cad20a9483a9a042b4f072fccde.png)
![](https://img.xkw.com/dksih/QBM/2014/7/8/1571815473430528/1571815479418880/STEM/1a80ac80293445d89c8d273a40148d2b.png)
![](https://img.xkw.com/dksih/QBM/2014/7/8/1571815473430528/1571815479418880/STEM/297e9b2eecc145ce8a1275612bafc233.png)
求证:(1)
![](https://img.xkw.com/dksih/QBM/2014/7/8/1571815473430528/1571815479418880/STEM/f2ba9a649e884ceaac776a83c382f12d.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b9d52494a2d4fdfe7071f89583c51d89.png)
![](https://img.xkw.com/dksih/QBM/2014/7/8/1571815473430528/1571815479418880/STEM/6d52a35b7c44447e99264a109e41c0e1.png)
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