如图,已知在矩形
中,点
是
上的一点,点
是
上的一点,
,且
,
,矩形
的周长为
,求
的长.
![](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/03902478df1a55bc99703210bccab910.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/e0133c119bdff050752f8912a4ace330.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/3fa1b5b6051d500fe6c6f1c19c7ee49f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/4c750cbbbe03c2d4fb2b4ea84f659631.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/411b38a18046fea8e9fab1f9f9b80a5f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d5df73433f151b6016f23788ebd995ec.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/68a83fdd2ba72a2dba0b6b10bb3e06b9.png)
![](https://img.xkw.com/dksih/QBM/2019/9/16/2291991949877248/2292470641156097/STEM/d96e7a5e5a10436b88686b248382296b.png?resizew=150)
更新时间:2019-09-17 07:46:22
|
【知识点】 根据矩形的性质与判定求线段长
相似题推荐
解答题-问答题
|
适中
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名校
【推荐1】常州市某校数学兴趣小组借助无人机测量一条河流的宽度
.如图所示,一架水平飞行的无人机在A处测得正前方河流的左岸C处的俯角为
,无人机沿水平线
方向继续飞行25米至B处,测得正前方河流右岸D处的俯角为
.线段
的长为无人机距地面的垂直高度,点M、C、D在同一条直线上.其中
,
米.
![](https://img.xkw.com/dksih/QBM/2022/5/27/2988219102937088/2992104734007296/STEM/17c82b3a-944b-47f2-8f1f-6f92fad2cc24.png?resizew=279)
(1)求无人机的飞行高度
;(结果保留根号)
(2)求河流的宽度
.(结果精确到1米,参考数据:
,
)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9d78abbad68bbbf12af10cd40ef4c353.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e170f206fdbbd834aad7580c727e2cc6.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/6aa2b5e09f8ec785c59900a529390a02.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f6b86c22b670a8e9f3896f9e8883fbbb.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d50703c46b6153945d718b198f03b4b5.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a9a7de5b70003502e40b95b3b7d3d933.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9f53c7a8eef00044ae5e2cf1aa3eadbd.png)
![](https://img.xkw.com/dksih/QBM/2022/5/27/2988219102937088/2992104734007296/STEM/17c82b3a-944b-47f2-8f1f-6f92fad2cc24.png?resizew=279)
(1)求无人机的飞行高度
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d50703c46b6153945d718b198f03b4b5.png)
(2)求河流的宽度
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9d78abbad68bbbf12af10cd40ef4c353.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/4c894b7d6baa55c80c64e74748dad898.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/460317e7c26f95b9b29cfe1a89b796d6.png)
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适中
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【推荐2】如图,是一个放置于水平桌面的平板支架的示意图,底座的高
为
,宽
为
,点
是
的中点,连杆
、
的长度分别为
和
,
,且连杆
、
与
始终在同一平面内.(参考数据:
,
,
,
)
到水平桌面的距离;
(2)产品说明书提示,若点
与
的水平距离超过
的长度,则该支架会倾倒.现将
调节为
,此时支架会倾倒吗?
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f52a58fbaf4fea03567e88a9f0f6e37e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f3a9eed64d225267a58cd001db67e2a3.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/411461db15ee8086332c531e086c40c7.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/cdb26c5cdef6f16f4b39cd091041b439.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5963abe8f421bd99a2aaa94831a951e9.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/411461db15ee8086332c531e086c40c7.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0dc5c9827dfd0be5a9c85962d6ccbfb1.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9d78abbad68bbbf12af10cd40ef4c353.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a2a9fde55ea236718639753330b4ce40.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/fc31bf4b6ed8cf336432a5a2791e67e3.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a3bfba27fe56312acbe718d761794d5d.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0dc5c9827dfd0be5a9c85962d6ccbfb1.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9d78abbad68bbbf12af10cd40ef4c353.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f52a58fbaf4fea03567e88a9f0f6e37e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b42bc5b38d885947d3fbe37f864eea21.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b75c6a8fa614b4750df0ec9213701ae0.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/6735f0e52e0ba2378c811e2e7d12ae34.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/3130ee9078c84414bd4c6edf82e032e3.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c5db41a1f31d6baee7c69990811edb9f.png)
(2)产品说明书提示,若点
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/8455657dde27aabe6adb7b188e031c11.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5963abe8f421bd99a2aaa94831a951e9.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f50b3ae183997b707d16eb4e7f6712fa.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f3702b5620dbee356a8e560c78d223ad.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/391479c151307826c9765a47a5f10503.png)
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