如图,在
中,
,点D,E分别在边
上,若
,
,连接
交于点F,则
的值为______ .
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e428e7a09732be85c1224e9c8f6a71c5.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7e3262fc038bbec5e7c8cc47df08bef7.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/893bd35964001f6481611f8929bcf8a1.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9d48e9deca35c034db4734cf9d2ddf90.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/4591d4cbade5c26bc5467b9661064ead.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/cb2bfa7a87a9c7120c20a3b55af313e2.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/4be5ff69cf410d6dfd62f40f85708bce.png)
更新时间:2024-06-07 09:47:33
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【推荐1】如图,在Rt△ABC中,∠B=90°,以AC为斜边向外作等腰直角三角形COA,已知BC=8,OB=10
,则另一直角边AB的长为__________ .
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/cf298f00799cbf34b4db26f5f63af92f.png)
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名校
【推荐2】如图,在
中,
,
,
是
边上一点,且
.
是
延长线上一点,连接
交
于
,若
,则
的长度为______ .
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【推荐1】如图,在菱形
中,
,
,点
是
的中点,过点
作
,垂足为
,将
沿点
到点
的方向平移,得到
,设点
、
分别是
、
的中点,当点
与点
重合时,四边形
的面积为____ .
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/411b38a18046fea8e9fab1f9f9b80a5f.png)
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![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f52a58fbaf4fea03567e88a9f0f6e37e.png)
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![](https://staticzujuan.xkw.com/quesimg/Upload/formula/4c105d6ba18fbb0581fb982175e2eac9.png)
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【推荐2】如图,已知
,点
在边
上,
.过点
作
于点
,以
为一边在
内作等边
,点
是
围成的区域(包括各边)内的一点,过点
作
交
于点
,作
交
于点
.设
,
,则
最大值是_______ .
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d5c5cdefcf66650a0678b206ebd245ae.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5963abe8f421bd99a2aaa94831a951e9.png)
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【推荐1】如图,在矩形
中,
,点E是边
上的一个动点(E不与
重合),连接
,过点E作
,交边
于点F,给出以下结论:
①若
,则
平分
;
②若
,则
;
③在点E运动的过程中,动点F可能与点A重合;
④在点E从C运动到D的过程中,
逐渐增大;其中正确的是________ .(写出正确结论的序号)
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①若
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![](https://staticzujuan.xkw.com/quesimg/Upload/formula/85c4bdfb0db1e31e8459df1d15f9ab55.png)
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②若
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![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a735623f6421547958695d005f2cbf7d.png)
③在点E运动的过程中,动点F可能与点A重合;
④在点E从C运动到D的过程中,
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【推荐2】如图,正方形ABCD中,M、N分别为BC、CD的中点,连结AM、AC交BN与E、F,则EF:FN的值是______ .
![](https://img.xkw.com/dksih/QBM/2013/5/24/1573657118097408/1573657123700736/STEM/655b394f00d8400f9c17bab9682c2c55.png?resizew=173)
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【推荐1】如图,在矩形
中,
,
,点
、
分别在边
、
上(不与端点重合),且
于点
.若
,则![](https://staticzujuan.xkw.com/quesimg/Upload/formula/08f7972d633ad0079a564b047768d2d3.png)
_______ .
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5cb3f9a5da641be35117fd35ba07a6aa.png)
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【推荐2】如图,在菱形纸片ABCD中,AB=2,∠A=60°,将菱形纸片翻折,使点A落在CD的中点E处,折痕为FG,点F,G分别在边AB,AD上,则cos∠EFG的值为________ .
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