如图,在边长为6的正方形ABCD中,点P为对角线AC上一动点,PE⊥AB于E,PF⊥BC于F,则EF的最小值为( )
![](https://img.xkw.com/dksih/QBM/2021/7/26/2772185467363328/2774565332533248/STEM/109b1dd8-d64f-4bb4-8f43-66388646b61f.png)
![](https://img.xkw.com/dksih/QBM/2021/7/26/2772185467363328/2774565332533248/STEM/109b1dd8-d64f-4bb4-8f43-66388646b61f.png)
A.![]() | B.![]() |
C.4 | D.3 |
20-21八年级下·山东烟台·期末 查看更多[2]
更新时间:2021-07-29 10:50:31
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【推荐1】如图,在正方形
和正方形
中,点D在
上,点B、C、E在同一条直线上,
,
,H是
的中点,连接
,则
的长是( )
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/411b38a18046fea8e9fab1f9f9b80a5f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0ce5d091ec7998a5f3e70a53da981719.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/abf80148409afb32ced0b4f59f1ba709.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/aa7aeb2a8d1437eeb4482c3b6ad9f315.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0761165f1176f3a5fe4f7b052832316d.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/6aa2b5e09f8ec785c59900a529390a02.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a6655e2fa64a32cd12fe0279afd65d73.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a6655e2fa64a32cd12fe0279afd65d73.png)
![](https://img.xkw.com/dksih/QBM/editorImg/2023/11/27/60c82d26-4d2c-451c-b569-09bad3049d09.png?resizew=189)
A.2 | B.![]() | C.![]() | D.![]() |
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【推荐2】如图,已知正方形
的边长为4,
是对角线
上一点,
于点
于点
,连接
.给出下列结论:①
;②四边形
的周长为10;③
;④
的最小值是
.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/411b38a18046fea8e9fab1f9f9b80a5f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/dad2a36927223bd70f426ba06aea4b45.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d40b319212a7e7528b053e1c7097e966.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ac2ef99db257cc1acb08e3a5e0006d49.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e5bbefd1aaac6012bf19f63fbe9cedd8.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a0ed1ec316bc54c37c4286c208f55667.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/91c06a5e768df445ad420d7946e68fb9.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d6350abc2bc9e38dca81a52a856c0f61.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9fce76109c3b574feaca9cd7029c2875.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/62f1aadf4291d961038e8db73a1b4098.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/49b50357a6545cae8348e3059312f520.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/cf298f00799cbf34b4db26f5f63af92f.png)
![](https://img.xkw.com/dksih/QBM/editorImg/2023/12/4/8d254dd9-854d-43b9-8b8d-307be55c55bb.png?resizew=109)
A.1 | B.2 | C.3 | D.4 |
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【推荐1】如图,已知正方形
的边长为3,点M在
上,
,点N是
上的一个动点,那么
的最小值是( )
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/411b38a18046fea8e9fab1f9f9b80a5f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9e52a8f07834cbbbe4224962672fbbb2.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e46902c589b964c055aee819dc3e4ad0.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/60ef95894ceebaf236170e8832dcf7e3.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/6702d692c1e5a3ddb2f77247bf008779.png)
A.3 | B.4 | C.![]() | D.![]() |
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【推荐2】如图,正方形
的边长等于4,且
边与
轴正半轴夹角为
,点O为坐标原点,则点C的坐标为( )
![](https://img.xkw.com/dksih/QBM/editorImg/2022/10/26/adb61eca-b1da-4736-86fc-5eebf467a9dc.png?resizew=144)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/3241d7fedd89d85711acd7a2635298af.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e2c3d2cba96f6f03520c0b3f6e4da03e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/47ffb694021b52653de5141ae27ba6d0.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7435836899f6cd9fd01d84568b02239e.png)
![](https://img.xkw.com/dksih/QBM/editorImg/2022/10/26/adb61eca-b1da-4736-86fc-5eebf467a9dc.png?resizew=144)
A.![]() | B.![]() | C.![]() | D.![]() |
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【推荐1】用一条长为18cm的细绳围成一个等腰三角形,若其中有一边的长为5cm,则该等腰三角形的腰长为( )cm
A.5 | B.6.5 | C.5或6.5 | D.6.5或8 |
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【推荐2】下列命题是真命题的是( )
A.三角形的三条高线相交于三角形内一点 |
B.三边长为![]() ![]() ![]() |
C.对于任意两个非负实数a、b,有![]() |
D.若等腰三角形一边长为2,周长为8,则腰长为3 |
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