选修 4-1:几何证明选讲
已知点
在圆
直径
的延长线上,
切圆
于
点,
分别交
,
于点
,
,
.
![](https://img.xkw.com/dksih/QBM/2017/11/28/1827047244275712/1828939645018112/STEM/53a59f6801fe4ac4bb86594e47f541b4.png?resizew=171)
(1)求证:
为
的平分线;
(2)若
,求
的值.
已知点
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c5db41a1f31d6baee7c69990811edb9f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/1dde8112e8eb968fd042418dd632759e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/85c4bdfb0db1e31e8459df1d15f9ab55.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9abaeba15f3abdd877bc701af52c5cd9.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/9d78abbad68bbbf12af10cd40ef4c353.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/68a83fdd2ba72a2dba0b6b10bb3e06b9.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f52a58fbaf4fea03567e88a9f0f6e37e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a0ed1ec316bc54c37c4286c208f55667.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/8455657dde27aabe6adb7b188e031c11.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/fcd546aa376d38da2cfbae4a38dcbd01.png)
![](https://img.xkw.com/dksih/QBM/2017/11/28/1827047244275712/1828939645018112/STEM/53a59f6801fe4ac4bb86594e47f541b4.png?resizew=171)
(1)求证:
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9d78abbad68bbbf12af10cd40ef4c353.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/8fabb884dc5f9609de491245463bbe9a.png)
(2)若
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/047dc9795efa99b6fb9fdf9778085dab.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d78dc4f4584665f0db3d9363784c1683.png)
17-18高三上·福建福州·期中 查看更多[2]
更新时间:2017-12-01 10:10:08
|
【知识点】 几何证明选讲
相似题推荐
解答题-证明题
|
较易
(0.85)
【推荐1】选修4-1:几何证明选讲
如图,
是⊙
直径,
与⊙
相切于
,
为线段
上一点,连接
分别交⊙
于![](https://img.xkw.com/dksih/QBM/2016/12/23/1619431100727296/1619431101374464/STEM/014153533fd64fdcad0f710ace30e110.png)
两点,连接
交
于点
.
![](https://img.xkw.com/dksih/QBM/2016/12/23/1619431100727296/1619431101374464/STEM/627bb6e7d08c48dca54a88765db90602.png)
(1)求证:
四点共圆;
(2)若
为
的三等分点且靠近
,
,
,求线段
的长.
如图,
![](https://img.xkw.com/dksih/QBM/2016/12/23/1619431100727296/1619431101374464/STEM/f4acbb2c672d49e5ac9d30aa8575117e.png)
![](https://img.xkw.com/dksih/QBM/2016/12/23/1619431100727296/1619431101374464/STEM/dc20e596c41f4de7ae393941513793b4.png)
![](https://img.xkw.com/dksih/QBM/2016/12/23/1619431100727296/1619431101374464/STEM/6860316ee54c4619a73cf84b3479cb34.png)
![](https://img.xkw.com/dksih/QBM/2016/12/23/1619431100727296/1619431101374464/STEM/dc20e596c41f4de7ae393941513793b4.png)
![](https://img.xkw.com/dksih/QBM/2016/12/23/1619431100727296/1619431101374464/STEM/5bfeb834a8de4d5fab2a35cb149d6082.png)
![](https://img.xkw.com/dksih/QBM/2016/12/23/1619431100727296/1619431101374464/STEM/ccb85bec02164fe3872be12f7f54b739.png)
![](https://img.xkw.com/dksih/QBM/2016/12/23/1619431100727296/1619431101374464/STEM/6860316ee54c4619a73cf84b3479cb34.png)
![](https://img.xkw.com/dksih/QBM/2016/12/23/1619431100727296/1619431101374464/STEM/83740875d0da43e3bf5be3872c343680.png)
![](https://img.xkw.com/dksih/QBM/2016/12/23/1619431100727296/1619431101374464/STEM/dc20e596c41f4de7ae393941513793b4.png)
![](https://img.xkw.com/dksih/QBM/2016/12/23/1619431100727296/1619431101374464/STEM/014153533fd64fdcad0f710ace30e110.png)
两点,连接
![](https://img.xkw.com/dksih/QBM/2016/12/23/1619431100727296/1619431101374464/STEM/6770fcfb6bc94a9d93967171d7192129.png)
![](https://img.xkw.com/dksih/QBM/2016/12/23/1619431100727296/1619431101374464/STEM/6860316ee54c4619a73cf84b3479cb34.png)
![](https://img.xkw.com/dksih/QBM/2016/12/23/1619431100727296/1619431101374464/STEM/e94fdede599c45f9b5a2d415e0d1d2e3.png)
![](https://img.xkw.com/dksih/QBM/2016/12/23/1619431100727296/1619431101374464/STEM/627bb6e7d08c48dca54a88765db90602.png)
(1)求证:
![](https://img.xkw.com/dksih/QBM/2016/12/23/1619431100727296/1619431101374464/STEM/45c887c2efca4d29a0aeec1bc9b04f0c.png)
(2)若
![](https://img.xkw.com/dksih/QBM/2016/12/23/1619431100727296/1619431101374464/STEM/e94fdede599c45f9b5a2d415e0d1d2e3.png)
![](https://img.xkw.com/dksih/QBM/2016/12/23/1619431100727296/1619431101374464/STEM/62ee75e6328a40f79a945c90586f78f3.png)
![](https://img.xkw.com/dksih/QBM/2016/12/23/1619431100727296/1619431101374464/STEM/ccb85bec02164fe3872be12f7f54b739.png)
![](https://img.xkw.com/dksih/QBM/2016/12/23/1619431100727296/1619431101374464/STEM/c9b83bfb828a4160aecb9b4a60ffe6f6.png)
![](https://img.xkw.com/dksih/QBM/2016/12/23/1619431100727296/1619431101374464/STEM/9c1547e061dc4d89ac930b70bf3df7af.png)
![](https://img.xkw.com/dksih/QBM/2016/12/23/1619431100727296/1619431101374464/STEM/54e91d13fa3043a7ab886a26107592af.png)
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解答题-证明题
|
较易
(0.85)
【推荐2】如图,
是圆
的直径,
是弦,
的平分线
交圆
于点
,
,交
的延长线于点
,
交
于点
.
![](https://img.xkw.com/dksih/QBM/2016/3/29/1572564572160000/1572564578017280/STEM/f3ab4708d7aa48c28db3b6cd3b5d30d3.png)
(1)求证:
是圆
的切线;
(2)若
,求
的值.
![](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/60ef95894ceebaf236170e8832dcf7e3.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/6062582a0a1679aa777451f25008411d.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/8455657dde27aabe6adb7b188e031c11.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/535a65c61f47d2b893706d4bc3499e20.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/a299d2b999568e80be8005565ba209a4.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/03902478df1a55bc99703210bccab910.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a0ed1ec316bc54c37c4286c208f55667.png)
![](https://img.xkw.com/dksih/QBM/2016/3/29/1572564572160000/1572564578017280/STEM/f3ab4708d7aa48c28db3b6cd3b5d30d3.png)
(1)求证:
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e6e490f703eb6c9bb1278c78ebc2d661.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/1dde8112e8eb968fd042418dd632759e.png)
(2)若
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/965fb2996af2e489d87040b255394a6f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/929e72e9d26c3bda1fba680ca48cd95d.png)
您最近一年使用:0次