如图1,在
中,
,
.
(1)求
边上的高
的长;
(2)如图2,点
、
分别在边
、
上,
、
在边
上,当四边形
是正方形时,求
的长.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0faed94a64b2dcfc6801b4fca0f16675.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/6eeb0c8df3d8c5260768c5e407b3583a.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b939af5ba06e279cce39396aaf0fae06.png)
(1)求
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/60ef95894ceebaf236170e8832dcf7e3.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/bcdae78f4d3b8d8213ac3ac9a9567eb5.png)
(2)如图2,点
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/8455657dde27aabe6adb7b188e031c11.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/0dc5c9827dfd0be5a9c85962d6ccbfb1.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/895dc3dc3a6606ff487a4c4863e18509.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a0ed1ec316bc54c37c4286c208f55667.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/60ef95894ceebaf236170e8832dcf7e3.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/82901484b0b4b192cdd45a88c6163aa3.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e6e490f703eb6c9bb1278c78ebc2d661.png)
![](https://img.xkw.com/dksih/QBM/2020/2/4/2391863608025088/2392032362831872/STEM/4e7a4c4b0d8b473b81ada923c380f5ff.png?resizew=240)
更新时间:2020-02-04 23:45:12
|
【知识点】 相似三角形的判定与性质综合
相似题推荐
解答题-证明题
|
适中
(0.65)
【推荐1】如图,
与
交于点
过点
,交
与点
,交
与点
,
.
![](https://img.xkw.com/dksih/QBM/editorImg/2022/12/30/94d1f2fc-968d-4c44-9a11-df8f4d9beb1c.png?resizew=157)
(1)求证:
.
(2)若
,求证:
.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/03902478df1a55bc99703210bccab910.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0dc5c9827dfd0be5a9c85962d6ccbfb1.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/df7aebe8c300dcd7eef3872c96d81311.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/1dde8112e8eb968fd042418dd632759e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f52a58fbaf4fea03567e88a9f0f6e37e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2a30f3a8b673cc28bd90c50cf1a35281.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9d78abbad68bbbf12af10cd40ef4c353.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2c115692082921121dff518101db754a.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/055783e0077a36ae10c793635548dcef.png)
![](https://img.xkw.com/dksih/QBM/editorImg/2022/12/30/94d1f2fc-968d-4c44-9a11-df8f4d9beb1c.png?resizew=157)
(1)求证:
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/439fbb8974a5f907205d26b47b420bf4.png)
(2)若
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7c45087cde2d66377517a3fce5553b35.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/108ebf3215a544f65ff55283bda648b9.png)
您最近一年使用:0次
解答题-证明题
|
适中
(0.65)
解题方法
【推荐2】在正方形
中,点
是
边上的动点,连接
.
![](https://img.xkw.com/dksih/QBM/2020/7/4/2498576865894400/2498698479607808/STEM/f5f061b1a42244c8b6bc7fffd04c647f.png?resizew=483)
(1)如图1,点
在
的延长线上,且
.
①求证:
;
②如图2,将
绕点
逆时针旋转
得到对应
,射线
交
于
,交
于
,连接
,试探究
与
之间的数量关系.
(2)如图3,若
,点
是
边上的动点,且
,连接
,直接写出
的最小值.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/411b38a18046fea8e9fab1f9f9b80a5f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2a30f3a8b673cc28bd90c50cf1a35281.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9d78abbad68bbbf12af10cd40ef4c353.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/85c4bdfb0db1e31e8459df1d15f9ab55.png)
![](https://img.xkw.com/dksih/QBM/2020/7/4/2498576865894400/2498698479607808/STEM/f5f061b1a42244c8b6bc7fffd04c647f.png?resizew=483)
(1)如图1,点
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a0ed1ec316bc54c37c4286c208f55667.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0dc5c9827dfd0be5a9c85962d6ccbfb1.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/21204d1c00149a21f59c004f6b927237.png)
①求证:
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f40b3bf6b27f936e0747de92151a1f77.png)
②如图2,将
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/89e8c3cf4bbfa6e00d38761560ddc6b4.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c5db41a1f31d6baee7c69990811edb9f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f6b86c22b670a8e9f3896f9e8883fbbb.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c79acd2f87178c4a1ddca13d74d2becc.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c63e36329f5e0979f5ee776ac5d06327.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9d78abbad68bbbf12af10cd40ef4c353.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/54a5d7d3b6b63fe5c24c3907b7a8eaa3.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c7e4fa04825ac7d071968056322d88be.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ac047e91852b91af639feec23a9598b2.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/db54223bb3fc2fe2497213a4d1f94827.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b39addc1173a458af87ed5c5e3f06466.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/db54223bb3fc2fe2497213a4d1f94827.png)
(2)如图3,若
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/fcd0ced286a0fbc7e4862f8147264277.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a0ed1ec316bc54c37c4286c208f55667.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0dc5c9827dfd0be5a9c85962d6ccbfb1.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/6fd1a29d03532a234cf6a7e06bf5fc87.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d004d2d115b477ade6af7ddb93db0df8.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5aa2be72873024c4c367c838c17f69c6.png)
您最近一年使用:0次
解答题-证明题
|
适中
(0.65)
【推荐3】(1)【问题发现】如图1,在Rt△ABC中,AB=AC,∠BAC=90°,点D为BC的中点,以CD为一边作正方形CDEF,点E恰好与点A重合,请判断线段BE与AF的数量关系并写出推断过程;
(2)【拓展研究】在(1)的条件下,如果正方形CDEF绕点C旋转,连接BE,CE,AF,线段BE与AF的数量关系有无变化?请仅就图2的情形给出证明;
(3)【结论运用】在(1)(2)的条件下,若△ABC的面积为2,当正方形CDEF旋转到B,E,F三点在同一直线上时,请直接写出线段AF的长.
(2)【拓展研究】在(1)的条件下,如果正方形CDEF绕点C旋转,连接BE,CE,AF,线段BE与AF的数量关系有无变化?请仅就图2的情形给出证明;
(3)【结论运用】在(1)(2)的条件下,若△ABC的面积为2,当正方形CDEF旋转到B,E,F三点在同一直线上时,请直接写出线段AF的长.
![](https://img.xkw.com/dksih/QBM/2019/6/7/2220460067536896/2221927082483712/STEM/c463117e1dc147b7aff94df20a00852a.png?resizew=454)
您最近一年使用:0次