如图,四边形ABCD中,AC平分∠BAD,∠ADC=∠ACB=90°,E为AB的中点,AC与DE交于点F.
(1)求证:CE∥AD;
(2)求证:AC2=AB•AD;
(3)若AC=
,AB=8,求
的值.
(1)求证:CE∥AD;
(2)求证:AC2=AB•AD;
(3)若AC=
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/41322821ce31416fdac8dd6e0aa41c71.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/fad75d52164547b022d8c895205a6c84.png)
![](https://img.xkw.com/dksih/QBM/2019/1/14/2118759772487680/2122964686225408/STEM/94d12c9fb47b4aa683ee919a12b4d57f.png?resizew=132)
更新时间:2019-01-20 20:05:37
|
【知识点】 相似三角形的判定与性质综合
相似题推荐
解答题-证明题
|
适中
(0.65)
【推荐1】如图,
是
的直径,C为
上一点,
和过点C的切线
互相垂直,垂足为D.
![](https://img.xkw.com/dksih/QBM/2022/5/26/2987616065724416/2987747014860800/STEM/3a66590e-42f5-485b-88e5-caf68bf1f7fe.png?resizew=165)
(1)求证:
;
(2)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/3d97cdc586744d208b6f69c9813af977.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/03902478df1a55bc99703210bccab910.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9d78abbad68bbbf12af10cd40ef4c353.png)
![](https://img.xkw.com/dksih/QBM/2022/5/26/2987616065724416/2987747014860800/STEM/3a66590e-42f5-485b-88e5-caf68bf1f7fe.png?resizew=165)
(1)求证:
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f8535c9834820fa6732d0532bf6ae308.png)
(2)若
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/4494a85de0be0b97a69348115aef8513.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9419302c045670b2f7384d6b0e7b7738.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9d78abbad68bbbf12af10cd40ef4c353.png)
您最近一年使用:0次
解答题-证明题
|
适中
(0.65)
名校
【推荐2】AB是半圆O的直径,直线l是
的切线,点P是切点.
交
于点C,连接PA,PC,OC,OP,AC与OP交于点D.
(1)如图1,证明:
;
![](https://img.xkw.com/dksih/QBM/2022/3/22/2941726373404672/2948827746541568/STEM/3f522149-23a2-4b3c-8e2c-bb8c7dbddc93.png?resizew=160)
(2)如图2,连接BC,过点P作
于点E,若
,
,求BC的长.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/3d97cdc586744d208b6f69c9813af977.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/444ba95e9f305321ddb4d262f7a0eebc.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/3d97cdc586744d208b6f69c9813af977.png)
(1)如图1,证明:
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/cb350cb6e6764d2fa68f6c4229c24d34.png)
![](https://img.xkw.com/dksih/QBM/2022/3/22/2941726373404672/2948827746541568/STEM/3f522149-23a2-4b3c-8e2c-bb8c7dbddc93.png?resizew=160)
(2)如图2,连接BC,过点P作
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/04fb30a9d07e410ac92c34b8ad0133db.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2d4fb1fe5859dd21a6efd4feae51a17e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/fc34db5860990e51ba31edc8cdd077c2.png)
![](https://img.xkw.com/dksih/QBM/2022/3/22/2941726373404672/2948827746541568/STEM/bc6c24a1-e8f2-499e-b54a-41ffa223b05b.png?resizew=160)
您最近一年使用:0次