真题
1 . 如图,CD为△ABC外接圆的切线,AB的延长线交直线CD于点D,E、F分别为弦AB与弦AC上的点,
且BC
AE=DC
AF,B、E、F、C四点共圆.
![](https://img.xkw.com/dksih/QBM/editorImg/2022/11/30/3d3c104e-8ea2-4617-b8c1-2376e90b2319.png?resizew=149)
(Ⅰ)证明:CA是△ABC外接圆的直径;
(Ⅱ)若DB=BE=EA,求过B、E、F、C四点的圆的面积与△ABC外接圆面积的比值.
且BC
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c97ec04a1aa7ac6fce72d589864940a2.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c97ec04a1aa7ac6fce72d589864940a2.png)
![](https://img.xkw.com/dksih/QBM/editorImg/2022/11/30/3d3c104e-8ea2-4617-b8c1-2376e90b2319.png?resizew=149)
(Ⅰ)证明:CA是△ABC外接圆的直径;
(Ⅱ)若DB=BE=EA,求过B、E、F、C四点的圆的面积与△ABC外接圆面积的比值.
您最近一年使用:0次
2019-01-30更新
|
3024次组卷
|
5卷引用:2016届河南省洛阳市高三考前练习二理科数学试卷
2016届河南省洛阳市高三考前练习二理科数学试卷2013年全国普通高等学校招生统一考试理科数学(新课标2卷)2013年全国普通高等学校招生统一考试文科数学(新课标2卷)(已下线)2014年高考数学文二轮专题复习与测试选修4-1几何证明选讲练习卷(已下线)2014届人教版高考数学文科二轮专题复习提分训练12练习卷
2 . 选修4-1:几何证明选讲
如图,
是
的直径,弦
延长线相交于点
为
延长线上一点,且
,
![](https://img.xkw.com/dksih/QBM/2016/7/1/1572865553932288/1572865560264704/STEM/103dea63b5f840cea5aef9055490c9ab.png)
求证:(1)
;(2)
.
如图,
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f52a58fbaf4fea03567e88a9f0f6e37e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7dea2ae9d515f9ab351ad72306b776ee.png)
![](https://img.xkw.com/dksih/QBM/2016/7/1/1572865553932288/1572865560264704/STEM/d3720e26217f4ef1b69a5c0c79c7f35f.png)
![](https://img.xkw.com/dksih/QBM/2016/7/1/1572865553932288/1572865560264704/STEM/ae6b7000e1fa4bd3843c225d8d8cac0b.png)
![](https://img.xkw.com/dksih/QBM/2016/7/1/1572865553932288/1572865560264704/STEM/d1efcaa101a04ec186909fd83239f351.png)
![](https://img.xkw.com/dksih/QBM/2016/7/1/1572865553932288/1572865560264704/STEM/77ad210035094f87b44f4226c539c9c4.png)
![](https://img.xkw.com/dksih/QBM/2016/7/1/1572865553932288/1572865560264704/STEM/103dea63b5f840cea5aef9055490c9ab.png)
求证:(1)
![](https://img.xkw.com/dksih/QBM/2016/7/1/1572865553932288/1572865560264704/STEM/ad909ccebbf24187a150cf1cb010e0c3.png)
![](https://img.xkw.com/dksih/QBM/2016/7/1/1572865553932288/1572865560264704/STEM/d3e72419d93a49449d22d63d1ec4be6f.png)
您最近一年使用:0次
2016-12-04更新
|
63次组卷
|
2卷引用:2016届河南省洛阳市高三考前综合练习五理科数学试卷
11-12高三下·河南洛阳·阶段练习
3 . 如图,直线
经过
上的点
,并且![](https://staticzujuan.xkw.com/quesimg/Upload/formula/6b9ea5432b5b54aa784e976b3312f47c.png)
交直线
于
,连接
.
![](https://img.xkw.com/dksih/QBM/editorImg/2022/6/16/40240f02-9896-470d-8e6b-5ff4af51a8e7.png?resizew=192)
(1)求证:直线
是
的切线;
(2)若![](https://staticzujuan.xkw.com/quesimg/Upload/formula/46d9c243d37a21a4504fb9ba0f43824e.png)
的半径为
,求
的长.
![](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/c5db41a1f31d6baee7c69990811edb9f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/6b9ea5432b5b54aa784e976b3312f47c.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/3d97cdc586744d208b6f69c9813af977.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b90e0f35eda1a729fed485f83da5ea9d.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a4bc45ba4c2ad98835bfdd40c2212ba9.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9fe702d06205c9850d6a87f18a273fe4.png)
![](https://img.xkw.com/dksih/QBM/editorImg/2022/6/16/40240f02-9896-470d-8e6b-5ff4af51a8e7.png?resizew=192)
(1)求证:直线
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f52a58fbaf4fea03567e88a9f0f6e37e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/3d97cdc586744d208b6f69c9813af977.png)
(2)若
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/46d9c243d37a21a4504fb9ba0f43824e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/3d97cdc586744d208b6f69c9813af977.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5ca7d1107389675d32b56ec097464c14.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ef4113c492885ba7c47fe42ac792578f.png)
您最近一年使用:0次
2011·河南洛阳·一模
4 . 在△ABC中,AB=AC,过点A的直线与其外接圆交于点P,交BC延长线于点D.
(1)求证:
;
(2)若AC=3,求AP•AD的值.
(1)求证:
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/32f44caa95b907ab06f85da6f52b9213.png)
(2)若AC=3,求AP•AD的值.
![](https://img.xkw.com/dksih/QBM/2011/2/28/1570019776937984/1570019782385664/STEM/9c20ec07a9c642d29d236e8536c83727.png?resizew=252)
您最近一年使用:0次
11-12高三上·河南洛阳·期末
5 . 选修4-1:几何证明选讲
如图,在△ABC中,∠ABC=90°,以BC为直径的圆O交
![](https://img.xkw.com/dksih/QBM/2011/5/19/1570209865703424/1570209870929920/STEM/0ae9fb78725341509c77d9d9f138fd59.png?resizew=89)
AC于点D,设E为AB的中点.
(1)求证:直线DE为圆O的切线;
(2)设CE交圆O于点F,求证:CD·CA=CF·CE.
如图,在△ABC中,∠ABC=90°,以BC为直径的圆O交
![](https://img.xkw.com/dksih/QBM/2011/5/19/1570209865703424/1570209870929920/STEM/0ae9fb78725341509c77d9d9f138fd59.png?resizew=89)
AC于点D,设E为AB的中点.
(1)求证:直线DE为圆O的切线;
(2)设CE交圆O于点F,求证:CD·CA=CF·CE.
您最近一年使用:0次
6 . 选修4-1:几何证明选讲
如图,在直角
中,
,
为
边上异于
的一点,以
为直径作圆
,并分别交
于点
.
![](https://img.xkw.com/dksih/QBM/2016/5/18/1578888292974592/1578888293785600/STEM/8aa464c6ea01423f9129f5fd4f95021e.png)
(1)证明:
四点共圆;
(2)若
为
的中点,且
,求
的长.
如图,在直角
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/dd936a2405709574af0a73543d94ad9c.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/af254745c1c19bd20e83344bee674ce7.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/8455657dde27aabe6adb7b188e031c11.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0dc5c9827dfd0be5a9c85962d6ccbfb1.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ab609a6574633ebabcff3e73fa862081.png)
![](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/97bde5efa645a4c1ed6874088400d6a7.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ad056c25c0fdcbcc765eb5cbc6093f2b.png)
![](https://img.xkw.com/dksih/QBM/2016/5/18/1578888292974592/1578888293785600/STEM/8aa464c6ea01423f9129f5fd4f95021e.png)
(1)证明:
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2860aa8df187c9fa3c1c25365fa813f1.png)
(2)若
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/8455657dde27aabe6adb7b188e031c11.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0dc5c9827dfd0be5a9c85962d6ccbfb1.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/53e0b10935ba479bb14a2674109e5ba3.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/68a83fdd2ba72a2dba0b6b10bb3e06b9.png)
您最近一年使用:0次
2016-12-04更新
|
217次组卷
|
4卷引用:2016届河南省洛阳市一中高三下学期第二次模拟理科数学试卷
7 . 选修4-1:几何证明选讲
如图,
与圆
相切于点
,
为圆
上两点,延长
交圆
于点
,
且交
于点
.
![](https://img.xkw.com/dksih/QBM/2016/8/24/1572989355376640/1572989361668096/STEM/a78550ab55594c369e773783426d1590.png)
(1)证明:
∽
;
(2)若
为圆
的直径,
,
,求
.
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/9d78abbad68bbbf12af10cd40ef4c353.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/1dde8112e8eb968fd042418dd632759e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/03902478df1a55bc99703210bccab910.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/094d11233794245d95ba79128ea3c4b9.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/21037e170bdbb322558e79c40c00b454.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a0ed1ec316bc54c37c4286c208f55667.png)
![](https://img.xkw.com/dksih/QBM/2016/8/24/1572989355376640/1572989361668096/STEM/a78550ab55594c369e773783426d1590.png)
(1)证明:
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/bb2dec12644272733ffdd9031aad1d37.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/705712479f3f5d26ce080b71230984cf.png)
(2)若
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/85c4bdfb0db1e31e8459df1d15f9ab55.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/1dde8112e8eb968fd042418dd632759e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/47acc08846fd9657acec59f221be23be.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/faffe3765c15f53305516895aa595a9b.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/8b662e49246aba79e1536ffec3197f8c.png)
您最近一年使用:0次
2016-12-04更新
|
94次组卷
|
2卷引用:2016届河南省洛阳市高三毕业班三练数学(理)试卷
8 . 选修4-1:几何证明选讲
在
的边
上分别取
,使得
,又点
是
的外心.
![](https://img.xkw.com/dksih/QBM/2016/8/8/1572964985274368/1572964991705088/STEM/a89e2fa6d00448a5862d054d644f0aae.png)
(1)证明:
四点共圆;
(2)证明:
在
的平分线上.
在
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/dd936a2405709574af0a73543d94ad9c.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e9e661d825b7a6061e4d26fe5c53df73.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/927456b0989846a2f1573844bbaa2105.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ae0e8585806f8f92167c392e0403c01e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/1dde8112e8eb968fd042418dd632759e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/6ec012a6e524839874fd5e757c5fef8e.png)
![](https://img.xkw.com/dksih/QBM/2016/8/8/1572964985274368/1572964991705088/STEM/a89e2fa6d00448a5862d054d644f0aae.png)
(1)证明:
![](https://img.xkw.com/dksih/QBM/2016/8/8/1572964985274368/1572964991705088/STEM/554a9f65c75c47cf8ea4e4e00bc921b9.png)
(2)证明:
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/1dde8112e8eb968fd042418dd632759e.png)
![](https://img.xkw.com/dksih/QBM/2016/8/8/1572964985274368/1572964991705088/STEM/ad7f4e0108c34af5b95e6c382c98ec00.png)
您最近一年使用:0次