1 . 选修4—1:几何证明选讲
如图,直线
经过圆
上的点
,并且
,圆
交直线
于点
,其中
在线段
上.连结
,
.
![](https://img.xkw.com/dksih/QBM/2016/11/22/1573165365239808/1573165371768832/STEM/0cedd218d0184b8d9ab0cc78d3bd0dd8.png)
(1)证明:直线
是圆
的切线;
(2)若
,圆
的半径为
,求
的长.
如图,直线
![](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/c5db41a1f31d6baee7c69990811edb9f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/555598eef3c9b2c0bacfe350a80e5c4d.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/a4bc45ba4c2ad98835bfdd40c2212ba9.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/8455657dde27aabe6adb7b188e031c11.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b90e0f35eda1a729fed485f83da5ea9d.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/1fc56c77464a17a1e97b568762a3e2c6.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9d78abbad68bbbf12af10cd40ef4c353.png)
![](https://img.xkw.com/dksih/QBM/2016/11/22/1573165365239808/1573165371768832/STEM/0cedd218d0184b8d9ab0cc78d3bd0dd8.png)
(1)证明:直线
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f52a58fbaf4fea03567e88a9f0f6e37e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/1dde8112e8eb968fd042418dd632759e.png)
(2)若
![](https://img.xkw.com/dksih/QBM/2016/11/22/1573165365239808/1573165371768832/STEM/59ecc87c0c00458b83e2d048d9b6e32b.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/1dde8112e8eb968fd042418dd632759e.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
2 . 选修4-1:几何证明选讲
如图,四边形
是⊙
的内接四边形,延长
和
相交于点
,
,
.
![](https://img.xkw.com/dksih/QBM/2015/10/20/1572259485089792/1572259491373056/STEM/bab05a6b70914409b9ccc233459c2dce.png)
(Ⅰ)求
的值;
(Ⅱ)若
为⊙
的直径,且
,求
的长.
如图,四边形
![](https://img.xkw.com/dksih/QBM/2015/10/20/1572259485089792/1572259491373056/STEM/796242376e8240199aefe3b7af00b0fc.png)
![](https://img.xkw.com/dksih/QBM/2015/10/20/1572259485089792/1572259491373056/STEM/34f255d17a534d258a71d8f3ff882796.png)
![](https://img.xkw.com/dksih/QBM/2015/10/20/1572259485089792/1572259491373056/STEM/d6ed371acc6e4996b2f42a8c118b5be4.png)
![](https://img.xkw.com/dksih/QBM/2015/10/20/1572259485089792/1572259491373056/STEM/171fffbca4f94670ba7239c3c5b10863.png)
![](https://img.xkw.com/dksih/QBM/2015/10/20/1572259485089792/1572259491373056/STEM/ad27fa310b8c42c894396f127548e31e.png)
![](https://img.xkw.com/dksih/QBM/2015/10/20/1572259485089792/1572259491373056/STEM/33e0c83893404c4182d1fad333f55b4a.png)
![](https://img.xkw.com/dksih/QBM/2015/10/20/1572259485089792/1572259491373056/STEM/2f608b8367084b3db743d06466930c68.png)
![](https://img.xkw.com/dksih/QBM/2015/10/20/1572259485089792/1572259491373056/STEM/bab05a6b70914409b9ccc233459c2dce.png)
(Ⅰ)求
![](https://img.xkw.com/dksih/QBM/2015/10/20/1572259485089792/1572259491373056/STEM/2b5e290f300c44e1ac1b90735049377c.png)
(Ⅱ)若
![](https://img.xkw.com/dksih/QBM/2015/10/20/1572259485089792/1572259491373056/STEM/0e4d178913b0425dac9efb078d769209.png)
![](https://img.xkw.com/dksih/QBM/2015/10/20/1572259485089792/1572259491373056/STEM/34f255d17a534d258a71d8f3ff882796.png)
![](https://img.xkw.com/dksih/QBM/2015/10/20/1572259485089792/1572259491373056/STEM/308884b466fa4954b7c6dfacea944e12.png)
![](https://img.xkw.com/dksih/QBM/2015/10/20/1572259485089792/1572259491373056/STEM/2da0e5184594431d821ea9176dd4f1a5.png)
您最近一年使用:0次
2016-12-03更新
|
20次组卷
|
3卷引用:2016届广东省广州六中等六校高三第一次联考理科数学试卷
12-13高三·河南南阳·阶段练习
3 . 如图,在
中,
是
的角平分线,
的外接圆交
于点
,
.
![](https://img.xkw.com/dksih/QBM/2016/6/7/1572696996036608/1572697002213376/STEM/a1d2f57cf6d74c838b101b1424485b37.png)
(1)证明:
;
(2)当
,
时,求
的长.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/dd936a2405709574af0a73543d94ad9c.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9d78abbad68bbbf12af10cd40ef4c353.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0427054c47e348f35771872fd0215a8a.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0c71855e55064d1dc59eabe43e73a881.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0dc5c9827dfd0be5a9c85962d6ccbfb1.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2a30f3a8b673cc28bd90c50cf1a35281.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/846071242f981289741ad19f4e7190cf.png)
![](https://img.xkw.com/dksih/QBM/2016/6/7/1572696996036608/1572697002213376/STEM/a1d2f57cf6d74c838b101b1424485b37.png)
(1)证明:
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/679372e54c59c5cf67931b12b9833e02.png)
(2)当
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ca036d049f5205cf04cb1b9c5cd03f97.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/72f7d9f5e71bfef8188b1216c1276c2d.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/03902478df1a55bc99703210bccab910.png)
您最近一年使用:0次
2016-12-02更新
|
728次组卷
|
7卷引用:2017届广东海珠区高三上学期调研测试一数学理试卷