如图,
中,
,
为
中点,
在
上,
,若
,则
的长为______ .
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/dd967903ed5a6f640a5b801ec8be0070.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ed10df4140819d5451773a45de66201b.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/8455657dde27aabe6adb7b188e031c11.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/60ef95894ceebaf236170e8832dcf7e3.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2a30f3a8b673cc28bd90c50cf1a35281.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f52a58fbaf4fea03567e88a9f0f6e37e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5fcc45db602b3738caada3ce35afb3a2.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f306ba11b8632c1ca25bccf19f321bd2.png)
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![](https://img.xkw.com/dksih/QBM/editorImg/2023/4/26/55453bf9-9cbe-48bb-9d33-e48dc515e37c.png?resizew=170)
更新时间:2023-04-23 20:11:21
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【推荐1】如图,在矩形ABCD中,
,
,将
沿射线BD平移长度
得到
,连接
,
,则当
是直角三角形时,a的长为___________ .
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名校
【推荐2】平面直角坐标系中,
、
,连接
、
,则![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ff3fe47cb8e2c9a134f7cf263d033fce.png)
________ ;点C在y轴上,作点C关于直线
、
的对称点D、E,则
的最小值为________ .
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/60d295a4cc3a58f9f38ee98337313c81.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c78b8c8353ed5d9144e451c56afa9607.png)
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【推荐1】如图,在
中,
, D为
的中点,
,E,F分别在
上,若
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的周长是__________ .(用含m,n的代数式表示)
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【推荐2】如图,面积为6的平行四边形纸片
中,
,
,按下列步骤进行裁剪和拼图:第一步,如图①,将平行四边形纸片沿对角线
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和
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剪开(其中
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和
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处(边
与
重合),将
纸片置于
处(边
与
重合).则由纸片拼成的五边形
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![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ab2a2834d80ff574e79eae8ca8d4e94f.png)
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【推荐1】如图,在矩形ABCD中,
,
,将
沿射线BD平移长度
得到
,连接
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,则当
是直角三角形时,a的长为___________ .
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【推荐2】如图,四边形
是边长为
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【推荐1】如图,已知⊙
的半径为9cm,射线
经过点
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自P点以
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方向运动,同时动点
也自P点以2cm/s的速度沿射线
方向运动,则它们从点
出发_______ s后
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相切.
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【推荐2】在平面直角坐标系
中,点P在y轴上,点
,
,
为
的外接圆.当
最大时,点P的坐标为__________ .
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