1 . 选修4-1:几何证明选讲
等腰梯形
中,
,
交于点
,
平分
,
为梯形
外接圆的切线,交
的延长线于点
.
![](https://img.xkw.com/dksih/QBM/2016/11/12/1573144670306304/1573144676483072/STEM/ad60bfc1b8d54caf9dc22fd4a87cd286.png)
(I)求证:
;
(II)若
,
,
,求
的长.
等腰梯形
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/411b38a18046fea8e9fab1f9f9b80a5f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/34e0a957a55460c72673c0f2ee90dbb3.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/8aed74d65e981fbfddc940923b5c91b5.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/acc290b44635265137fdf13146b6a6d9.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/60ef95894ceebaf236170e8832dcf7e3.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e90be2908153fa6e4d84afe7d4c955e5.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/20a541b81584a032f571159ea152c85a.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/411b38a18046fea8e9fab1f9f9b80a5f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d40b319212a7e7528b053e1c7097e966.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/dad2a36927223bd70f426ba06aea4b45.png)
![](https://img.xkw.com/dksih/QBM/2016/11/12/1573144670306304/1573144676483072/STEM/ad60bfc1b8d54caf9dc22fd4a87cd286.png)
(I)求证:
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/4c4f39e61059fb69457616c166702657.png)
(II)若
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/efc6e4b936d7a800e839a30c3839574d.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ecbb2dce15f3d0fe839688575d2a8ff8.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/dc2ee4d985e634e127a8db9fae7ab837.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/84d454c82d9e52747563d47b68099249.png)
您最近一年使用:0次
2 . 如图所示,
内接于圆O,
是
的中点,∠
的平分线分别交
和圆
于点
,
.
![](https://img.xkw.com/dksih/QBM/2016/7/22/1572932940955648/1572932947156992/STEM/6debfcf0aa7b4c77b9ff787cac4f2033.png)
(Ⅰ)求证:
是
外接圆的切线;
(Ⅱ)若
,
,求
的值.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/dd936a2405709574af0a73543d94ad9c.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/8455657dde27aabe6adb7b188e031c11.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2df6b72cbe1f6b402d5835dda1de3701.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/efb49d869110f27140f5c1934143db2e.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/2a30f3a8b673cc28bd90c50cf1a35281.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a0ed1ec316bc54c37c4286c208f55667.png)
![](https://img.xkw.com/dksih/QBM/2016/7/22/1572932940955648/1572932947156992/STEM/6debfcf0aa7b4c77b9ff787cac4f2033.png)
(Ⅰ)求证:
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/274cf35acb4a1748d15c39d15a9bea7b.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d73d6dde62cacc0d1fc589d3f1565304.png)
(Ⅱ)若
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/efc6e4b936d7a800e839a30c3839574d.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7bb5b12692517a39c320f99a479eb055.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0fe2ad465f0bd58356b12da8fa72483a.png)
您最近一年使用:0次
2016-12-04更新
|
125次组卷
|
3卷引用:2016届福建厦门双十中学高三下热身考理科数学试卷