11-12高三下·河南南阳·周测
1 . 如图,
是
的弦,
是
上的点,
垂直于弦
,过点F作
的切线,交
的延长线于D,连结
交
于点E.
(I) 求证:
;
(II) 若
,
,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/bec6bb6af96dffcef6e7508095e33518.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/3d97cdc586744d208b6f69c9813af977.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/828628c0876b45381c9a0edeb0fec236.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/f52a58fbaf4fea03567e88a9f0f6e37e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/4cae70b8a9d2d2e96dea62c00ced04b9.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f52a58fbaf4fea03567e88a9f0f6e37e.png)
(I) 求证:
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b0832663dc2ac31bb883db666b58c2da.png)
(II) 若
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/adc90c2d45477e166b02359525f40aa6.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/bbe308dcc38f31d52a77ee65bb00dd88.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d004d2d115b477ade6af7ddb93db0df8.png)
![](https://img.xkw.com/dksih/QBM/2012/3/31/1570824837292032/1570824842682368/STEM/464884a1218441ebbaacdb49ef6fe026.png?resizew=168)
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2011·河南郑州·二模
2 . 选修4—1:几何证明选讲
如图,在△ABC中,∠C为钝角,点E,H分别是边AB上的点,点K和M分别是边AC和BC上的点,且AH=AC,EB=BC,AE=AK,BH=BM.
(Ⅰ)求证:E、H、M、K四点共圆;
(Ⅱ)若KE=EH,CE=3,求线段KM的长.
如图,在△ABC中,∠C为钝角,点E,H分别是边AB上的点,点K和M分别是边AC和BC上的点,且AH=AC,EB=BC,AE=AK,BH=BM.
(Ⅰ)求证:E、H、M、K四点共圆;
(Ⅱ)若KE=EH,CE=3,求线段KM的长.
![](https://img.xkw.com/dksih/QBM/2011/3/28/1570082402541568/1570082408013824/STEM/64dafb1f36b44094932560ebad332554.png?resizew=225)
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3 . 选修4-1:几何证明选讲
如图
是
直径,
是
切线,
交
与点
.
![](https://img.xkw.com/dksih/QBM/2016/11/10/1573138122612736/1573138129133568/STEM/032eb3a5ce50466bae5d05e5521f1f24.png)
(Ⅰ)若
为
中点,求证:
是
切线;
(Ⅱ)若
,求
的大小.
如图
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f52a58fbaf4fea03567e88a9f0f6e37e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/880be04496b4e06b1c47d433d880b442.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/60ef95894ceebaf236170e8832dcf7e3.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/880be04496b4e06b1c47d433d880b442.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0dc5c9827dfd0be5a9c85962d6ccbfb1.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/880be04496b4e06b1c47d433d880b442.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2a30f3a8b673cc28bd90c50cf1a35281.png)
![](https://img.xkw.com/dksih/QBM/2016/11/10/1573138122612736/1573138129133568/STEM/032eb3a5ce50466bae5d05e5521f1f24.png)
(Ⅰ)若
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/8455657dde27aabe6adb7b188e031c11.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/60ef95894ceebaf236170e8832dcf7e3.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e6e490f703eb6c9bb1278c78ebc2d661.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/880be04496b4e06b1c47d433d880b442.png)
(Ⅱ)若
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/db966856ec2cbe925bdf8ee29fc93611.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0427054c47e348f35771872fd0215a8a.png)
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4 . 已知四边形
为圆
的内接四边形,且
,其对角线
与
相交于点
.过点
作圆
的切线交
的延长线于点
.
![](https://img.xkw.com/dksih/QBM/2016/6/1/1572683042848768/1572683049271296/STEM/eba0a85b01e443c2872a5fca74406206.png)
(I)求证:
;
(II)若
,求证:
.
![](https://img.xkw.com/dksih/QBM/2016/6/1/1572683042848768/1572683049271296/STEM/c1aed038f3534498a437fe4656651362.png)
![](https://img.xkw.com/dksih/QBM/2016/6/1/1572683042848768/1572683049271296/STEM/6884ebf765214e92a3e51ec95c828f57.png)
![](https://img.xkw.com/dksih/QBM/2016/6/1/1572683042848768/1572683049271296/STEM/04aba819001943faa0f602bf04b52fcb.png)
![](https://img.xkw.com/dksih/QBM/2016/6/1/1572683042848768/1572683049271296/STEM/c64b71f098554966b9f0db23c34d8d4e.png)
![](https://img.xkw.com/dksih/QBM/2016/6/1/1572683042848768/1572683049271296/STEM/686b6e79fc4f48168df06a59eec23ad7.png)
![](https://img.xkw.com/dksih/QBM/2016/6/1/1572683042848768/1572683049271296/STEM/0969e595ed0f4cf5b40bb168819e5c0f.png)
![](https://img.xkw.com/dksih/QBM/2016/6/1/1572683042848768/1572683049271296/STEM/e9872bc905294bfa87593165c3dba318.png)
![](https://img.xkw.com/dksih/QBM/2016/6/1/1572683042848768/1572683049271296/STEM/6884ebf765214e92a3e51ec95c828f57.png)
![](https://img.xkw.com/dksih/QBM/2016/6/1/1572683042848768/1572683049271296/STEM/f1f9a96b87df4ef8840213699c1cb76d.png)
![](https://img.xkw.com/dksih/QBM/2016/6/1/1572683042848768/1572683049271296/STEM/575ee7c8e9b1459088170c982ef5995d.png)
![](https://img.xkw.com/dksih/QBM/2016/6/1/1572683042848768/1572683049271296/STEM/eba0a85b01e443c2872a5fca74406206.png)
(I)求证:
![](https://img.xkw.com/dksih/QBM/2016/6/1/1572683042848768/1572683049271296/STEM/8b7ee8d20a934c459254b2c1545bc938.png)
(II)若
![](https://img.xkw.com/dksih/QBM/2016/6/1/1572683042848768/1572683049271296/STEM/68e8fe3a01f3491cb934548f68708c70.png)
![](https://img.xkw.com/dksih/QBM/2016/6/1/1572683042848768/1572683049271296/STEM/0e0ebf40db8942f69c7673c7643690f3.png)
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5 . 如图,在
中,
,以
上一点
为圆心,以
为半径的圆交
于点
,交
于点
.
![](https://img.xkw.com/dksih/QBM/2016/5/30/1572654780727296/1572654786953216/STEM/a2a7540f77cd43eb9b32ceb6e1bcd8b3.png)
(1)求证:
;
(2)如果
是
的切线,
为
的中点,当
时,求
的值.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/dd936a2405709574af0a73543d94ad9c.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/38b5eb31f888914a31c04dc6e1849281.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0dc5c9827dfd0be5a9c85962d6ccbfb1.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/1dde8112e8eb968fd042418dd632759e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b90e0f35eda1a729fed485f83da5ea9d.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f52a58fbaf4fea03567e88a9f0f6e37e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ac047e91852b91af639feec23a9598b2.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0dc5c9827dfd0be5a9c85962d6ccbfb1.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/54a5d7d3b6b63fe5c24c3907b7a8eaa3.png)
![](https://img.xkw.com/dksih/QBM/2016/5/30/1572654780727296/1572654786953216/STEM/a2a7540f77cd43eb9b32ceb6e1bcd8b3.png)
(1)求证:
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5e3bd3f8c14d8f7b829bedd0b12c6e19.png)
(2)如果
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/db54223bb3fc2fe2497213a4d1f94827.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/880be04496b4e06b1c47d433d880b442.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/54a5d7d3b6b63fe5c24c3907b7a8eaa3.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/828628c0876b45381c9a0edeb0fec236.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d70dc2c20619a4fc12a0cfda59af5b69.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f52a58fbaf4fea03567e88a9f0f6e37e.png)
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6 . 如图,已知
为圆
的一条直径,以端点
为圆心的圆交直线
于
两点,交圆
于
两点,过点
作垂直于
的直线,交直线
于
点.
![](https://img.xkw.com/dksih/QBM/editorImg/2022/8/4/88cf66ba-35c9-4877-8261-eda0916f10a8.png?resizew=189)
(1)求证:
四点共圆;
(2)若
,求
外接圆的半径.
![](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/f52a58fbaf4fea03567e88a9f0f6e37e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/72a21acc387aa273b83b8387baa73e88.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/1dde8112e8eb968fd042418dd632759e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ad056c25c0fdcbcc765eb5cbc6093f2b.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/8455657dde27aabe6adb7b188e031c11.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/03902478df1a55bc99703210bccab910.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/6aa2b5e09f8ec785c59900a529390a02.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/73465a1f9aa03481295bf6bd3c6903ac.png)
![](https://img.xkw.com/dksih/QBM/editorImg/2022/8/4/88cf66ba-35c9-4877-8261-eda0916f10a8.png?resizew=189)
(1)求证:
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/fad8f0046014e9c9fcd1b341be7fc7f6.png)
(2)若
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/6f05d52a447e5ee79d99f1a7120a8adf.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d7e64c953aaf341e772a5fe776fbc78a.png)
您最近一年使用:0次
2016-12-03更新
|
382次组卷
|
5卷引用:2014-2015学年河南省南阳市高二下学期期末文科数学试卷1
7 . 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:2015届河南省郑州市高中毕业年级第二次质量预测理科数学试卷
2012·河北石家庄·一模
名校
8 . 选修4-1:几何证明选讲
已知
中,
,D为
外接圆劣弧AC上的点(不与点A、C重合),延长BD至E,延长AD交BC的延长线于F.
![](https://img.xkw.com/dksih/QBM/editorImg/2022/7/19/1f54aced-1257-4dbf-b956-8ee412ca35a3.png?resizew=179)
(1)求证:
;
(2)求证:
.
已知
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/15c0dbe3c080c4c4636c64803e5c1f76.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/047dc9795efa99b6fb9fdf9778085dab.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/15c0dbe3c080c4c4636c64803e5c1f76.png)
![](https://img.xkw.com/dksih/QBM/editorImg/2022/7/19/1f54aced-1257-4dbf-b956-8ee412ca35a3.png?resizew=179)
(1)求证:
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/4748010af2b117057264c79b90fb203a.png)
(2)求证:
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/06561de2ef3074de18a272915a6d303d.png)
您最近一年使用:0次
2016-12-03更新
|
483次组卷
|
12卷引用:2017届河南部分重点中学高三上学期联考一数学(理)试卷
2017届河南部分重点中学高三上学期联考一数学(理)试卷(已下线)2012届河北省石家庄市高三第一次模拟考试文科数学试卷2015届河北省唐山一中等五校高三上学期第二次联考理科数学试卷2015届河北省唐山一中等五校高三上学期第二次联考文科数学试卷2015届吉林省实验中学高三上学期第三次模拟考试理科数学试卷2016届山西省康杰中学等校高三上学期第二次联考文科数学试卷2016届山西省康杰中学等校高三上学期第二次联考理科数学试卷2017届广东省仲元中学高三9月月考数学(理)试卷2017届甘肃高台县一中高三理上学期检测五数学试卷2017届甘肃高台县一中高三文上学期检测五数学试卷2017届甘肃省高台县第一中学高三上学期期末考试文数试卷2017届甘肃省高台县第一中学高三上学期期末考试理数学试卷
13-14高三上·河南安阳·阶段练习
9 . 如图,点
是以线段
为直径的圆
上一点,
于点
,过点
作圆
的切线,与
的延长线交于点
,点
是
的中点,连结
并延长与
相交于点
,延长
与
的延长线相交于点
.
![](https://img.xkw.com/dksih/QBM/2013/11/26/1571396785496064/1571396791599104/STEM/7d5a5767e1b946ffac4f174bdef13f15.png)
(Ⅰ)求证:
;
(Ⅱ)求证:
是圆
的切线.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5963abe8f421bd99a2aaa94831a951e9.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0dc5c9827dfd0be5a9c85962d6ccbfb1.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/1dde8112e8eb968fd042418dd632759e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/17be90850a55d8b037e15d45de2bab0b.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/8455657dde27aabe6adb7b188e031c11.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7f9e8449aad35c5d840a3395ea86df6d.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/1dde8112e8eb968fd042418dd632759e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9abaeba15f3abdd877bc701af52c5cd9.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2a30f3a8b673cc28bd90c50cf1a35281.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/895dc3dc3a6606ff487a4c4863e18509.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/03902478df1a55bc99703210bccab910.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/abf80148409afb32ced0b4f59f1ba709.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/85c4bdfb0db1e31e8459df1d15f9ab55.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a0ed1ec316bc54c37c4286c208f55667.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/6aa2b5e09f8ec785c59900a529390a02.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/6b1bd1adfe4cc6566218f19970c2fd3b.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/dad2a36927223bd70f426ba06aea4b45.png)
![](https://img.xkw.com/dksih/QBM/2013/11/26/1571396785496064/1571396791599104/STEM/7d5a5767e1b946ffac4f174bdef13f15.png)
(Ⅰ)求证:
![](https://img.xkw.com/dksih/QBM/2013/11/26/1571396785496064/1571396791599104/STEM/6dc84470267949fb8a883a16ab8a7d96.png)
(Ⅱ)求证:
![](https://img.xkw.com/dksih/QBM/2013/11/26/1571396785496064/1571396791599104/STEM/8166b2e2e45c49419df251e3de260e2e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/1dde8112e8eb968fd042418dd632759e.png)
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2013·河南郑州·一模
10 . 如图,在△ABC中,CD是∠ACB的平分线,△ACD的外接圆交BC于点E,AB=2AC.
![](https://img.xkw.com/dksih/QBM/2016/3/28/1572560111501312/1572560117145600/STEM/e1066d69f14c4558aded214b8d4dc80a.png)
(Ⅰ)求证:BE=2AD;
(Ⅱ)当AC=1,EC=2时,求AD的长.
![](https://img.xkw.com/dksih/QBM/2016/3/28/1572560111501312/1572560117145600/STEM/e1066d69f14c4558aded214b8d4dc80a.png)
(Ⅰ)求证:BE=2AD;
(Ⅱ)当AC=1,EC=2时,求AD的长.
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2016-12-02更新
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