如图,菱形ABCD内两点M、N,满足MB⊥BC,MD⊥DC,NB⊥BA,ND⊥DA,若四边形BMDN的面积是菱形ABCD面积的
,则cosA=_____ .
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d3ffd5c35bba71ea54c28622b6cf505d.png)
![](https://img.xkw.com/dksih/QBM/2018/1/7/1854842713612288/1856114421768192/STEM/296865cc25ba41e09731b43e3e8d2e28.png?resizew=142)
2017·浙江台州·二模 查看更多[6]
更新时间:2017-06-15 15:01:04
|
相似题推荐
填空题
|
较难
(0.4)
【推荐1】已知:平行四边形
,连接
,
,点D是AC上一点,连接
并延长交
于点H,点E是
上一点,连接
,若
,
,
,
,则![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d9f63d194aa0d4091618b6f41f569ee2.png)
______ .
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0760712e3e2ea02b755b751e760d0c55.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/60ef95894ceebaf236170e8832dcf7e3.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/047dc9795efa99b6fb9fdf9778085dab.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d40b319212a7e7528b053e1c7097e966.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/db54223bb3fc2fe2497213a4d1f94827.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d40b319212a7e7528b053e1c7097e966.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/4eedae8d316c76e3d0b451256de03fb9.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/1d9a8b7acbadde7b5ad5ea51c51fecbc.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/de8626be63a95a3c43f05406dd7b76b2.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9ee69fb937492bd3d7d1afbfef26c102.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/295796017815cbf63543ae24f89680cd.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d9f63d194aa0d4091618b6f41f569ee2.png)
![](https://img.xkw.com/dksih/QBM/editorImg/2023/11/8/583e450e-0994-42f8-8178-b929d71fca3c.png?resizew=200)
您最近一年使用:0次
填空题
|
较难
(0.4)
名校
【推荐2】如图,
,点M、N分别为角的两边
、
上的点,
平分
,点P为射线
上一点,且
,
,若射线
上有一点Q,则
的最小值为______ .
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/dc1eb76fe74cba30f7cbcde349ba80da.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ef4113c492885ba7c47fe42ac792578f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b90e0f35eda1a729fed485f83da5ea9d.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/828628c0876b45381c9a0edeb0fec236.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/6d7b2fe01a33c4825f9974ed9663a99c.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/828628c0876b45381c9a0edeb0fec236.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d0cb52aacb4c08a49a7d823ee78aa331.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/74ad89306be5262122aa1004c238c97e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/828628c0876b45381c9a0edeb0fec236.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/3171b3d11c6f4619e189677345357508.png)
![](https://img.xkw.com/dksih/QBM/editorImg/2023/3/21/fb1bbc4e-fe7a-43e2-adef-40069f179367.png?resizew=184)
您最近一年使用:0次
填空题
|
较难
(0.4)
【推荐1】如图所示,平行四边形内有两个全等的正六边形,若阴影部分的面积记为
,平行四边形的面积记为
,则
的值为____ .
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e097c8d4c948de063796bd19f85b3a9a.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/1e0bd63f55069a3bc870915010b39225.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/235f0a6fb218d28383e6f27f2df1f50f.png)
![](https://img.xkw.com/dksih/QBM/editorImg/2023/10/31/79329f7d-4ea7-41e3-a5e6-864f1647a8b1.png?resizew=150)
您最近一年使用:0次
填空题
|
较难
(0.4)
【推荐2】如图,在菱形ABCD中,AB=6,∠DAB=60°,AE分别交BC,BD于点E,F,CE=2,连接CF.给出以下结论:①△ABF≌△CBF;②点E到AB的距离是3
;③tan∠DCF=
;④△ABF的面积为
.其中正确的结论序号是_____
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a7ffe8515ff6183c1c7775dc6f94bdb8.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/3dd6160ab7a53bc6b98193efb01f8ffd.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/8bad8f1e3c596a657c1c84bed522a980.png)
![](https://img.xkw.com/dksih/QBM/2019/5/26/2211863532658688/2212284231401472/STEM/4116b985c3a4443e8000c7dc32fba037.png?resizew=151)
您最近一年使用:0次
填空题
|
较难
(0.4)
名校
【推荐1】如图,在矩形ABCD中,
,
,点E,F分别在边AD,BC上,且
,沿直线EF翻折,点A的对应点
恰好落在对角线AC上,点B的对应点为
;分别在线段EF,
上取点M,N,沿直线MN二次翻折,使点F与点E重合,则线段MN的长为______ .
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/efc6e4b936d7a800e839a30c3839574d.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a306417e43670260e4b68a928a22071f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/30b0393ce62b24aa5f9b740d4cc6743b.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e7c314398e26ffc7164b82946eeb4273.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/3953cec61ac602ce5eb59b7912352179.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7bb0628cecbfc98d390e5447d52414e8.png)
![](https://img.xkw.com/dksih/QBM/2022/1/14/2894363282579456/2920515820969984/STEM/90844ad2-d959-42bc-a8e9-e79271d64dc1.png?resizew=232)
您最近一年使用:0次
填空题
|
较难
(0.4)
【推荐2】如图,AB⊥MN,CD⊥MN,垂足分别为B,D,AB=2,CD=4,BD=3.若在直线MN上存在点P,能使△PAB与△PCD相似,则PB=_____
![](https://img.xkw.com/dksih/QBM/2018/12/22/2102260539170816/2103672719974401/STEM/6ae1fad635864ce78c43f7f0a9ec3ac2.png?resizew=159)
您最近一年使用:0次