2017高三·全国·专题练习
1 . 如图,已知正方形ABCD的边长为3,E、F分别是AB、BC边上的点,且∠EDF=45°,将△DAE绕点D逆时针旋转90°,得到△DCM.若AE=1,则FM的长为______ .
![](https://img.xkw.com/dksih/QBM/2018/4/16/1925358141726720/1929655888379904/STEM/75717cac7d0f44c39ef11f9cf22cca91.png?resizew=163)
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2017高三·全国·专题练习
2 . 如图,已知△ABC中,AB=AC,∠BAC=90°,直角∠EPF的顶点P是BC中点,两边PE,PF分别交AB,AC于点E,F,给出以下五个结论:①AE=CF;②∠APE=∠CPF;③△EPF是等腰三角形;④EF=AP;⑤S四边形AEPF=S△APC.当∠EPF在△ABC内绕顶点P旋转时(点E不与A,B重合),其中正确的序号有________________ .
![](https://img.xkw.com/dksih/QBM/2018/4/16/1925358141726720/1929655888289792/STEM/1f9c42c34ae0466086c3307d00710707.png?resizew=135)
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2017高三·全国·专题练习
3 . 如图,△ABC中,AB=6,DE∥AC,将△BDE绕点B顺时针旋转得到△BD′E′,点D的对应点D′落在边BC上.已知BE′=5,D′C=4,则BC的长为______ .
![](https://img.xkw.com/dksih/QBM/2018/4/16/1925358141726720/1929655888117760/STEM/fdfa455cfb9045ad9de882503c434bc5.png?resizew=224)
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2017高三·全国·专题练习
4 . (2017广东广州)如图,平面直角坐标系中
是原点,
的顶点
的坐标分别是
,点
把线段
三等分,延长
分别交
于点
,连接
,则下列结论:
①
是
的中点;②
与
相似;③四边形
的面积是
;④
;其中正确的结论是 __________ .(填写所有正确结论的序号)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/1dde8112e8eb968fd042418dd632759e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/8e698404fde91350c873592032ea5326.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/098a3e7d1f1890863b7483a98b618119.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2ec32dae2a8966c629cdaea0cca4d25d.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/91e1e4115d78e625e9e0f47cdade3286.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b90e0f35eda1a729fed485f83da5ea9d.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/55f18975e22970b8fde117a588d9b681.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5c87b8e05d61ddc69dbc02772d719d2e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0cf33d73483c93f24cc6a1d76ef22ca6.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c63e36329f5e0979f5ee776ac5d06327.png)
①
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a0ed1ec316bc54c37c4286c208f55667.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ef4113c492885ba7c47fe42ac792578f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ab3c024b213dbe2016bf593071d7856c.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/1f18f78116d37176a4e7a7b5d0764268.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/82901484b0b4b192cdd45a88c6163aa3.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f3d754c4ad51e4482e12a615d20a13fb.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/cf0f572db5c9ca057212b60d9c2163e7.png)
![](https://img.xkw.com/dksih/QBM/2018/4/16/1925357956227072/1929155435225088/STEM/e322abc96d32435cbe9db4eb83878547.png?resizew=153)
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2017高三·全国·专题练习
5 . 如图,点P是正方形ABCD的对角线BD上一点,PE⊥BC于点E,PF⊥CD于点F,连接EF.给出下列五个结论:①AP=EF;②AP⊥EF;③△APD一定是等腰三角形;④∠PFE=∠BAP;⑤PD=
EC.其中正确结论的序号是____________ .
![](https://img.xkw.com/dksih/QBM/2018/4/16/1925357956227072/1929155435380736/STEM/fc9aeb869ee04ea4b28ba7ede19fe259.png?resizew=17)
![](https://img.xkw.com/dksih/QBM/2018/4/16/1925357956227072/1929155435380736/STEM/ea9fe734dae641a7822c22a0a7cf807a.png?resizew=110)
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2017高三·全国·专题练习
6 . 如图,在一张矩形纸片ABCD中,AB=4,BC=8,点E,F分别在AD,BC上,将纸片ABCD沿直线EF折叠,点C落在AD上的一点H处,点D落在点G处,有以下四个结论:
①四边形CFHE是菱形;②线段BF的取值范围为3≤BF≤4;
③EC平分∠DCH;④当点H与点A重合时,EF=
.
以上结论中,你认为正确的有______ .(填序号)
①四边形CFHE是菱形;②线段BF的取值范围为3≤BF≤4;
③EC平分∠DCH;④当点H与点A重合时,EF=
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9b91d650c2fc1a741fabdb333b09aeb6.png)
以上结论中,你认为正确的有
![](https://img.xkw.com/dksih/QBM/2018/4/16/1925357956227072/1929155435438080/STEM/790688633b8c49b4b961e564d2a03b16.png?resizew=184)
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2010高三·全国·专题练习
7 . 如图所示,过
外一点
作一条直线与
交于
,
两点,已知
,点
到
的切线长
,则弦
的长为_______ .
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/3d97cdc586744d208b6f69c9813af977.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/dad2a36927223bd70f426ba06aea4b45.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/3d97cdc586744d208b6f69c9813af977.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5963abe8f421bd99a2aaa94831a951e9.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7f9e8449aad35c5d840a3395ea86df6d.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0b80ee363635d73f601654339028daec.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/dad2a36927223bd70f426ba06aea4b45.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/3d97cdc586744d208b6f69c9813af977.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f5fca8c94add435f4aefb933ffe55a01.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f52a58fbaf4fea03567e88a9f0f6e37e.png)
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2010·广东汕头·一模
8 . 如图,圆O的割线PBA过圆心O,弦CD交PA于点F,且△COF∽△PDF,PB ="OA"=2,则PF= ____________
![](https://img.xkw.com/dksih/QBM/2013/6/13/1571243317706752/1571243323326464/STEM/2efab2c43bc04ebf92fce446f4ca2a46.png?resizew=196)
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9 . 如上图,EB、EC是⊙O的两条切线,B、C是切点,A、D是⊙O上两点,如果∠E=46°,∠DCF=32°,则∠A的度数是________
![](https://img.xkw.com/dksih/QBM/2011/6/7/1570238435598336/1570238440374272/STEM/5e7c092980854c6290813da476d5c3e1.png?resizew=168)
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真题
10 . (几何证明选讲选做题)如图,在直角梯形ABCD中,DC∥AB,CB⊥AB,AB=AD=a,CD=
,点E,F分别为线段AB,CD的中点,则EF=_______ .
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/576833b76e9cad3b523f87132308df99.png)
![](https://img.xkw.com/dksih/QBM/2010/6/23/1569766052364288/1569766057615360/STEM/29f92148-c0cd-47f6-81c0-a6073706d036.png)
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