如图,折叠菱形纸片
,使得
的对应边
过点B,
为折痕.若
,当
时,
的值等于( )
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/411b38a18046fea8e9fab1f9f9b80a5f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/03902478df1a55bc99703210bccab910.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/394c5d2f55221975503be8aa18022480.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/49b50357a6545cae8348e3059312f520.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a2594e927cb7ed022acc039c3bb136d0.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ee21c46eba9300543fe8fcba602a4173.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c1a2a3ca97740b27193a7289833819ee.png)
A.![]() | B.![]() | C.![]() | D.![]() |
更新时间:2024-05-10 21:17:54
|
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单选题
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适中
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【推荐1】如图,在
中,
,
,
,点D是BC边上的一个动点(不与B、C重合),过点D作
交AB边于点E,将
沿直线DE翻折,点B落在射线BC上的F处,连接AF,当
为直角三角形时,BD的长为( )
![](https://img.xkw.com/dksih/QBM/2022/3/26/2944569871097856/2945080264843264/STEM/fa3bd059-16ee-4c70-8bff-10fd4825afeb.png?resizew=173)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2f8f88798ec42a58dccd212586382b23.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7e3262fc038bbec5e7c8cc47df08bef7.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/56d3c9ce32b721995f355eea411340e3.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/3f8eeeea1c9652cacce976f8129cf520.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/bffd657e48b15b9b54a55817e2c26b22.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/febc9a89d0d1c97b88c0f4acd32b4e67.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/4c105d6ba18fbb0581fb982175e2eac9.png)
![](https://img.xkw.com/dksih/QBM/2022/3/26/2944569871097856/2945080264843264/STEM/fa3bd059-16ee-4c70-8bff-10fd4825afeb.png?resizew=173)
A.1 | B.3 | C.1或2 | D.1或3 |
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【推荐2】如图,在梯形ABCD中,AD∥BC,BD⊥DC,∠C=60°,AD=4,BC=6,则AB长为( )
![](https://img.xkw.com/dksih/QBM/2012/7/16/1573450476716032/1573450504183808/STEM/0378ddf9060047ecb47b57cb278a8b38.png?resizew=234)
![](https://img.xkw.com/dksih/QBM/2012/7/16/1573450476716032/1573450504183808/STEM/0378ddf9060047ecb47b57cb278a8b38.png?resizew=234)
A.2 | B.![]() | C.5 | D.2![]() |
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【推荐1】如图,在半径为10的
中,
,
是互相垂直的两条弦,垂足为点
,且
,则
的长为( )
![](https://img.xkw.com/dksih/QBM/editorImg/2023/2/9/847fc2d1-33be-4fc5-b8be-178fa1e11aa2.png?resizew=144)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/3d97cdc586744d208b6f69c9813af977.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f52a58fbaf4fea03567e88a9f0f6e37e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9d78abbad68bbbf12af10cd40ef4c353.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/dad2a36927223bd70f426ba06aea4b45.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/3a124837d8bdf8571c56f407fe093344.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d2be49c37e30a3ced0364c3e74d8c687.png)
![](https://img.xkw.com/dksih/QBM/editorImg/2023/2/9/847fc2d1-33be-4fc5-b8be-178fa1e11aa2.png?resizew=144)
A.11 | B.12 | C.13 | D.14 |
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【推荐2】如图,
,点
在
内部,且
,若
、
分别为边
、
上的动点,则
周长的最小值为( )
![](https://img.xkw.com/dksih/QBM/editorImg/2022/12/18/5880d3ef-296a-4c71-9bc5-ccbf9badc7ed.png?resizew=160)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/3f81e24376a13d648c2ed0dc73bc710e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/8455657dde27aabe6adb7b188e031c11.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7cbce11aa19b8bd2bf6ee5a834e005de.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/fc11331a7b2d2619b40ee6d34c3bd620.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2a30f3a8b673cc28bd90c50cf1a35281.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a0ed1ec316bc54c37c4286c208f55667.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f52a58fbaf4fea03567e88a9f0f6e37e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/60ef95894ceebaf236170e8832dcf7e3.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/72cb97395ebc5ee1b212afb7a97b985c.png)
![](https://img.xkw.com/dksih/QBM/editorImg/2022/12/18/5880d3ef-296a-4c71-9bc5-ccbf9badc7ed.png?resizew=160)
A.4 | B.![]() | C.![]() | D.8 |
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【推荐1】如图,菱形
的顶点A,D坐标分别是
,
,则点C的坐标是( )
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/411b38a18046fea8e9fab1f9f9b80a5f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2a2a5e336b6bcba6354fd366c892dd06.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/afa482d7bcaa385bfc3548b42a4bfb60.png)
A.![]() | B.![]() | C.![]() | D.![]() |
您最近一年使用:0次
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【推荐2】如图,在菱形ABCD中,∠BAD=60°,AB=
,点A,C在直线y=x上,且点A的坐标为(
,
).将菱形ABCD绕原点O逆时针旋转,每次旋转45°,则第85次旋转结束时,点C的坐标为( )
![](https://img.xkw.com/dksih/QBM/2022/3/30/2947609693601792/2951420173836288/STEM/81aa7556-a9c6-4e87-b703-a5f1c8ffd4c9.png?resizew=153)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a7ffe8515ff6183c1c7775dc6f94bdb8.png)
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![](https://staticzujuan.xkw.com/quesimg/Upload/formula/8d5989c84e320b504511f23eeb6e7357.png)
![](https://img.xkw.com/dksih/QBM/2022/3/30/2947609693601792/2951420173836288/STEM/81aa7556-a9c6-4e87-b703-a5f1c8ffd4c9.png?resizew=153)
A.(![]() | B.(0,2) | C.(0,![]() | D.(2,0) |
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名校
【推荐1】如图,在矩形ABCD中,
,
,M是CD上的一点,将
沿直线AM对折得到
,若AN平分
,则CN的长为( )
![](https://img.xkw.com/dksih/QBM/2022/3/4/2929163461582848/2930881023541248/STEM/e6a5158e-de79-4f33-ad83-a7862ff98dbc.png?resizew=161)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/6d4746df85049d1651d3f6c30212a7a9.png)
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![](https://staticzujuan.xkw.com/quesimg/Upload/formula/df92344b00e2aa8e7f0d1fa997b9dd04.png)
![](https://img.xkw.com/dksih/QBM/2022/3/4/2929163461582848/2930881023541248/STEM/e6a5158e-de79-4f33-ad83-a7862ff98dbc.png?resizew=161)
A.![]() | B.![]() | C.![]() | D.3 |
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【推荐2】如图,在
中,
,
,
,将
折叠,使
边落在
边上,展开后得到折痕
,则
的长度为( )
![](https://img.xkw.com/dksih/QBM/editorImg/2023/3/24/163afc02-1c2b-42d6-a21c-935b13b0abd5.png?resizew=124)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/15c0dbe3c080c4c4636c64803e5c1f76.png)
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A.2 | B.![]() | C.![]() | D.![]() |
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