1 . 选修4—1:几何证明选讲
如图,
是圆
的内接三角形,
是圆
的切线,
为切点,
交
于点
,交圆
于点
,若
,
,且
,求
.
如图,
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/dd936a2405709574af0a73543d94ad9c.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/1dde8112e8eb968fd042418dd632759e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/bd33764ff4efddfe11a98a609753715c.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/d2be49c37e30a3ced0364c3e74d8c687.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/60ef95894ceebaf236170e8832dcf7e3.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2a30f3a8b673cc28bd90c50cf1a35281.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/1dde8112e8eb968fd042418dd632759e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/8455657dde27aabe6adb7b188e031c11.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e5ddd5ff0e0f74c218d34e873a5b541b.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7bcb872b4cef76b937c60d5d90c37ee1.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/785ece624f595d448cfe1929c97cd59e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/1fc56c77464a17a1e97b568762a3e2c6.png)
![](https://img.xkw.com/dksih/QBM/2016/9/12/1573014516867072/1573014523142144/STEM/b5deca15662643539c6259a6a84b461b.png)
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2 . 选修4-1:几何证明选讲
如图所示,已知圆
的半径长为4,两条弦
相交于点
,若
,
,
为
的中点,
.
![](https://img.xkw.com/dksih/QBM/editorImg/2022/8/2/00d8c92a-01ba-40d3-9cd4-2b924d331ef8.png?resizew=208)
(1)求证:
平分
;
(2)求
的度数.
如图所示,已知圆
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/1dde8112e8eb968fd042418dd632759e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/73b3c032441543354c154ee67d744abb.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2a30f3a8b673cc28bd90c50cf1a35281.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/45fb9a3d61c62c86cde849e519e6bb8c.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/6b22529fdccd1f84fa42eb23df0cb2d2.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2a30f3a8b673cc28bd90c50cf1a35281.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/60ef95894ceebaf236170e8832dcf7e3.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/4a907f2391fe060a96c393bed0ae7e4c.png)
![](https://img.xkw.com/dksih/QBM/editorImg/2022/8/2/00d8c92a-01ba-40d3-9cd4-2b924d331ef8.png?resizew=208)
(1)求证:
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/60ef95894ceebaf236170e8832dcf7e3.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/727ad3e630a224303d6d3b8ad5c114ba.png)
(2)求
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/868ff1350bd72625328c85c3097cd85e.png)
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2016-12-04更新
|
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3卷引用:2016届安徽省合肥一中等六校高三第二次联考理科数学试卷
2012·河北石家庄·一模
名校
3 . 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)
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2016-12-03更新
|
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12卷引用:2012届河北省石家庄市高三第一次模拟考试文科数学试卷
(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届河南部分重点中学高三上学期联考一数学(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
4 . 选修4-1:几何证明选讲
四边形
内接于圆,
,过
点作圆的切线与
的延长线交于点
.
![](https://img.xkw.com/dksih/QBM/2016/12/14/1619428618551296/1619428619206656/STEM/73dfe253840543358f9da8e3c9dc2e2e.png)
(1)求证:
;
(2)若
,
,
,求
的长.
四边形
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/411b38a18046fea8e9fab1f9f9b80a5f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5a16dc02090b6e9263555061f14fbc8c.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/8455657dde27aabe6adb7b188e031c11.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f52a58fbaf4fea03567e88a9f0f6e37e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2a30f3a8b673cc28bd90c50cf1a35281.png)
![](https://img.xkw.com/dksih/QBM/2016/12/14/1619428618551296/1619428619206656/STEM/73dfe253840543358f9da8e3c9dc2e2e.png)
(1)求证:
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/bd6bcbc08e45c3f6c7fd17c6b8094277.png)
(2)若
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/8af620f6d204d310d8e3f267fdd6c3f8.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a55b6ce55e67f6e95e616eaf1ca3f6f8.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/30b0393ce62b24aa5f9b740d4cc6743b.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f52a58fbaf4fea03567e88a9f0f6e37e.png)
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5 . 如图5,四边形
是圆内接四边形,
、
的延长线交于点
,且
,
.
![](https://img.xkw.com/dksih/QBM/2016/12/7/1579043873144832/1579043873923072/STEM/012cddee36aa4ef0aba50ef8c7f48948.png)
(1) 求证:
;
(2) 当
,
时,求
的长.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/411b38a18046fea8e9fab1f9f9b80a5f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7dea2ae9d515f9ab351ad72306b776ee.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9d78abbad68bbbf12af10cd40ef4c353.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/dad2a36927223bd70f426ba06aea4b45.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2e735a28578ba191da6d4f3b0f8e8729.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/35eb9b8f539f3b38b39331b5d31602fd.png)
![](https://img.xkw.com/dksih/QBM/2016/12/7/1579043873144832/1579043873923072/STEM/012cddee36aa4ef0aba50ef8c7f48948.png)
(1) 求证:
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5e71b793101fa8bae9989e86474b306a.png)
(2) 当
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ef0402dd5ae3db10281f9f1e11738bcb.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ef0402dd5ae3db10281f9f1e11738bcb.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f52a58fbaf4fea03567e88a9f0f6e37e.png)
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6 . 如图,在⊙O中,点P为直径BA延长线上一点,直线PD切⊙O于点D,过点B作BH⊥PD,垂足为H,BH交⊙O于点C,连接BD.
![](https://img.xkw.com/dksih/QBM/2016/10/6/1578976699621376/1578976700203008/STEM/229f242f82aa4ddbba354fa389283b31.png)
(1)求证:BD平分∠ABH;
(2)如果AB=10,BC=6,求BD的长;
(3)在(2)的条件下,当E是弧AB的中点,DE交AB于点F,求DE·DF的值.
![](https://img.xkw.com/dksih/QBM/2016/10/6/1578976699621376/1578976700203008/STEM/229f242f82aa4ddbba354fa389283b31.png)
(1)求证:BD平分∠ABH;
(2)如果AB=10,BC=6,求BD的长;
(3)在(2)的条件下,当E是弧AB的中点,DE交AB于点F,求DE·DF的值.
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7 . 如图,
是
边
上的一点,
内接于圆
,且
,
是
的中点,
的延长线交
于点
,
![](https://img.xkw.com/dksih/QBM/2016/6/7/1574337471602688/1574337804812288/STEM/5c2d4ee0841842a4825879b440f72280.png)
证明:(1)
是圆
的切线;(2)
.
![](https://img.xkw.com/dksih/QBM/2016/6/7/1574337471602688/1574337804812288/STEM/f987b80fbf45448b9b74e9216d48e084.png)
![](https://img.xkw.com/dksih/QBM/2016/6/7/1574337471602688/1574337804812288/STEM/b31153bf2f5c4e4cb00913b5f39302cf.png)
![](https://img.xkw.com/dksih/QBM/2016/6/7/1574337471602688/1574337804812288/STEM/b1bf819dd2f14fe69b8925d5f221fb14.png)
![](https://img.xkw.com/dksih/QBM/2016/6/7/1574337471602688/1574337804812288/STEM/fc394ab263734769bd5e0e6aa99aab3a.png)
![](https://img.xkw.com/dksih/QBM/2016/6/7/1574337471602688/1574337804812288/STEM/bc60581c0c464852b2cb0a502aa01540.png)
![](https://img.xkw.com/dksih/QBM/2016/6/7/1574337471602688/1574337804812288/STEM/ff6343b7e3e9492f8aa2b022e9894fcb.png)
![](https://img.xkw.com/dksih/QBM/2016/6/7/1574337471602688/1574337804812288/STEM/2a2ed26a04a3446094f84f34b2ba7821.png)
![](https://img.xkw.com/dksih/QBM/2016/6/7/1574337471602688/1574337804812288/STEM/734ac48750e04a91a6567aa56af96586.png)
![](https://img.xkw.com/dksih/QBM/2016/6/7/1574337471602688/1574337804812288/STEM/0093df35519242faa20479285453be63.png)
![](https://img.xkw.com/dksih/QBM/2016/6/7/1574337471602688/1574337804812288/STEM/9e5863933e3a44d1a2ff0ef95b9b177e.png)
![](https://img.xkw.com/dksih/QBM/2016/6/7/1574337471602688/1574337804812288/STEM/dddb90cdf239435da6b49d622dbf3ead.png)
![](https://img.xkw.com/dksih/QBM/2016/6/7/1574337471602688/1574337804812288/STEM/5c2d4ee0841842a4825879b440f72280.png)
证明:(1)
![](https://img.xkw.com/dksih/QBM/2016/6/7/1574337471602688/1574337804812288/STEM/7bb845e10e2742c39cd5797a6121aa9d.png)
![](https://img.xkw.com/dksih/QBM/2016/6/7/1574337471602688/1574337804812288/STEM/bc60581c0c464852b2cb0a502aa01540.png)
![](https://img.xkw.com/dksih/QBM/2016/6/7/1574337471602688/1574337804812288/STEM/457a15f12ee743d8b2305f9d44fe7a97.png)
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8 . 选修4-1:几何证明选讲
如下图,四边形
内接于
,过点
作
的切线
交
的延长线于
,已知
.
![](https://img.xkw.com/dksih/QBM/2016/12/1/1573190598074368/1573190603907072/STEM/413d671276e44bc9a7ba456eae9ad2ce.png)
(Ⅰ)若
是
的直径,求
的大小;
(Ⅱ)若
,求证:
.
如下图,四边形
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/411b38a18046fea8e9fab1f9f9b80a5f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/880be04496b4e06b1c47d433d880b442.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5963abe8f421bd99a2aaa94831a951e9.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/880be04496b4e06b1c47d433d880b442.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/4f541f7ae7c39082d202efd28805c54e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/6b1bd1adfe4cc6566218f19970c2fd3b.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/dad2a36927223bd70f426ba06aea4b45.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0a2ce04e29ecab05af9c8d1b4c81d516.png)
![](https://img.xkw.com/dksih/QBM/2016/12/1/1573190598074368/1573190603907072/STEM/413d671276e44bc9a7ba456eae9ad2ce.png)
(Ⅰ)若
![](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/001fb1746a5c0d71c5d645e024fa8b3e.png)
(Ⅱ)若
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a4ca81d66713ac3f0dcc6b1b3209b76e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/fbbe3f5c93f7c60104ca98978d5a3f45.png)
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9 . 选修4-1:几何证明选讲
如图,
为圆
上一点,点
在直线
的延长线上,过点
作圆
的切线交
的延长线于点
,
.
![](https://img.xkw.com/dksih/QBM/editorImg/2022/8/7/2f81819c-a931-4c06-91c6-cdd82b586811.png?resizew=208)
(1)证明:
;
(2)若
,求圆
的半径.
如图,
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2a30f3a8b673cc28bd90c50cf1a35281.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/d40b319212a7e7528b053e1c7097e966.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/68a83fdd2ba72a2dba0b6b10bb3e06b9.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c5db41a1f31d6baee7c69990811edb9f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5aa5357d8bbc8778d64cd38cff09ceb8.png)
![](https://img.xkw.com/dksih/QBM/editorImg/2022/8/7/2f81819c-a931-4c06-91c6-cdd82b586811.png?resizew=208)
(1)证明:
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/72e2ee429f753da92a711b40ec0dd6bb.png)
(2)若
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/704700e172bf313d187557bcd3867115.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/1dde8112e8eb968fd042418dd632759e.png)
您最近一年使用:0次
2016-12-05更新
|
232次组卷
|
2卷引用:2017届吉林长春市普通高中高三上质监一数学理试卷
10 . 几何证明选讲
如图,过点
分别作⊙
的切线
与割线
,
为切点,
与⊙
交于
两点,圆心
在
的内部,
,
与
交于点
.
(1)在线段
上是否存在一点
,使
四点共圆?若存在,请确定点
的位置;若不存在,请说明理由;
(2)若
,证明:
.
如图,过点
![](https://img.xkw.com/dksih/QBM/2016/11/25/1573179582693376/1573179589148672/STEM/d3f7c8c2535346f49553bb4df6795004.png)
![](https://img.xkw.com/dksih/QBM/2016/11/25/1573179582693376/1573179589148672/STEM/84db6ec9974b4e4980f39ffd58ab6dc8.png)
![](https://img.xkw.com/dksih/QBM/2016/11/25/1573179582693376/1573179589148672/STEM/78f4e1778eef4a5eb5d5d8fb3782770a.png)
![](https://img.xkw.com/dksih/QBM/2016/11/25/1573179582693376/1573179589148672/STEM/f5213c81323944a2a81d341c9af35f07.png)
![](https://img.xkw.com/dksih/QBM/2016/11/25/1573179582693376/1573179589148672/STEM/506a56e586c1434dae85d76044bf8938.png)
![](https://img.xkw.com/dksih/QBM/2016/11/25/1573179582693376/1573179589148672/STEM/f5213c81323944a2a81d341c9af35f07.png)
![](https://img.xkw.com/dksih/QBM/2016/11/25/1573179582693376/1573179589148672/STEM/84db6ec9974b4e4980f39ffd58ab6dc8.png)
![](https://img.xkw.com/dksih/QBM/2016/11/25/1573179582693376/1573179589148672/STEM/6c0a8d323b47451495dccd736acbdfb0.png)
![](https://img.xkw.com/dksih/QBM/2016/11/25/1573179582693376/1573179589148672/STEM/84db6ec9974b4e4980f39ffd58ab6dc8.png)
![](https://img.xkw.com/dksih/QBM/2016/11/25/1573179582693376/1573179589148672/STEM/3442b847f17e46b8acdf08220d172ca7.png)
![](https://img.xkw.com/dksih/QBM/2016/11/25/1573179582693376/1573179589148672/STEM/eb5e6171718643b595203027615c7032.png)
![](https://img.xkw.com/dksih/QBM/2016/11/25/1573179582693376/1573179589148672/STEM/9f3328aacba94ae2af583c7ee34381de.png)
![](https://img.xkw.com/dksih/QBM/2016/11/25/1573179582693376/1573179589148672/STEM/d9a9137ac0a1487eb24a8a3fb71e3647.png)
![](https://img.xkw.com/dksih/QBM/2016/11/25/1573179582693376/1573179589148672/STEM/ac4979804a1849d0afcee14ff3eb152a.png)
(1)在线段
![](https://img.xkw.com/dksih/QBM/2016/11/25/1573179582693376/1573179589148672/STEM/73a57ae9b48e4cfdbbbda51561ced2e8.png)
![](https://img.xkw.com/dksih/QBM/2016/11/25/1573179582693376/1573179589148672/STEM/6eed780c34a948648ef1a2b566673d42.png)
![](https://img.xkw.com/dksih/QBM/2016/11/25/1573179582693376/1573179589148672/STEM/c97b826ac57c4acb91163f84de8d6eae.png)
![](https://img.xkw.com/dksih/QBM/2016/11/25/1573179582693376/1573179589148672/STEM/6eed780c34a948648ef1a2b566673d42.png)
(2)若
![](https://img.xkw.com/dksih/QBM/2016/11/25/1573179582693376/1573179589148672/STEM/81e251d8e06e409eae60820aad35f141.png)
![](https://img.xkw.com/dksih/QBM/2016/11/25/1573179582693376/1573179589148672/STEM/01fdd657f7ed4bfdb33190feab8b4583.png)
![](https://img.xkw.com/dksih/QBM/2016/11/25/1573179582693376/1573179589148672/STEM/8e6507a3881f4f838e76eb4189b9014a.png)
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