某中学数学学习小组欲测量古树的高度,他们在这棵古树的正前方的台阶上A点处测得古树顶端D的仰角为
,朝着这棵树的方向走到台阶下的点C处,测得古树顶端D的仰角为
,已知
于点B,
于点E,且
为4米,台阶
的坡度为1:2.且B,C,E三点在同一条直线上.(参考数据:
,
,
,
)
和台阶
的长(结果用根号表示);
(2)请求出古树
的高度(结果精确到0.1米)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/79a97bb4dcfab4ec7539bc783d563c49.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5f1c1ad367aad268ae505f25bc0d4d5b.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/bf4dc4d7d30af1cdce660795e0fd7d7c.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5322a78b02c2bc387ea7dce3e9461974.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/858f4783a23d678409cc85b389eb50dc.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a293545ac9d7a581ac01881f73e73de7.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/69c542247f13d71ee31d7a1132872d94.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9f1d7eb7d3db2910907b80956fb602f4.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c3d08f0ab6e573253450e03427e13db1.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/60ef95894ceebaf236170e8832dcf7e3.png)
(2)请求出古树
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e6e490f703eb6c9bb1278c78ebc2d661.png)
更新时间:2024-04-13 07:44:55
|
相似题推荐
解答题-问答题
|
适中
(0.65)
名校
【推荐1】如图,在平面直角坐标系
中,正比例函数
与反比例函数
的图象相交于A,B两点,其中点A的坐标为
.
![](https://img.xkw.com/dksih/QBM/editorImg/2022/12/16/41dae82e-c570-4a42-a3bb-c1889fb98ed7.png?resizew=205)
(1)直接写出点B的坐标为_______________;
(2)过点A作直线
,交反比例函数图象于另一点C,连接
,当线段
被y轴分成长度比为
的两部分时,求
的长.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7ee31829d0d4d5f779a957d7df8058ab.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/766bc42b7ead98238a339bb4dc42bb51.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/07854693dd2e33f66030d6106eb6e0ee.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a58d99ee4f2d7d8071c2e93eeadf9734.png)
![](https://img.xkw.com/dksih/QBM/editorImg/2022/12/16/41dae82e-c570-4a42-a3bb-c1889fb98ed7.png?resizew=205)
(1)直接写出点B的坐标为_______________;
(2)过点A作直线
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/60ef95894ceebaf236170e8832dcf7e3.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0dc5c9827dfd0be5a9c85962d6ccbfb1.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/60ef95894ceebaf236170e8832dcf7e3.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/37d65e051e943ab28fa57aee2fb57994.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0dc5c9827dfd0be5a9c85962d6ccbfb1.png)
您最近一年使用:0次
解答题-证明题
|
适中
(0.65)
【推荐2】如图,点
在以
为直径的
上,延长
到点
,连接
,过点
作
,交
的延长线于点
,交
于点
,连接
,
,若
.
(1)求证:
是
的切线;
(2)若
,求
的长.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c5db41a1f31d6baee7c69990811edb9f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f52a58fbaf4fea03567e88a9f0f6e37e.png)
![](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/2a30f3a8b673cc28bd90c50cf1a35281.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/4eedae8d316c76e3d0b451256de03fb9.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5963abe8f421bd99a2aaa94831a951e9.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9ccd5c41c921836b50f8e18abfdc5df3.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/1fc56c77464a17a1e97b568762a3e2c6.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/8455657dde27aabe6adb7b188e031c11.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/3d97cdc586744d208b6f69c9813af977.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/4cae70b8a9d2d2e96dea62c00ced04b9.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e8a41acb0b38022f0110a97fd656a946.png)
![](https://img.xkw.com/dksih/QBM/editorImg/2023/8/20/a0c7ec11-2707-40ea-bf56-fba3f75b616a.png?resizew=234)
(1)求证:
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e6e490f703eb6c9bb1278c78ebc2d661.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/3d97cdc586744d208b6f69c9813af977.png)
(2)若
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7a77f26a7be722e00baa984f769ec8d4.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/4cae70b8a9d2d2e96dea62c00ced04b9.png)
您最近一年使用:0次
解答题-证明题
|
适中
(0.65)
【推荐1】如图,
是
的直径,
平分
,点
,
在
上,过点
作
,交
的延长线于点
.
![](https://img.xkw.com/dksih/QBM/2022/1/17/2896444928491520/2952914141020160/STEM/d96c5afe-465b-4ad6-9e7b-f36612488c1b.png?resizew=152)
(1)求证:
是
的切线;
(2)若
,
,求
的长.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f52a58fbaf4fea03567e88a9f0f6e37e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/3d97cdc586744d208b6f69c9813af977.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/03902478df1a55bc99703210bccab910.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7cbce11aa19b8bd2bf6ee5a834e005de.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c5db41a1f31d6baee7c69990811edb9f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/8455657dde27aabe6adb7b188e031c11.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/3d97cdc586744d208b6f69c9813af977.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/8455657dde27aabe6adb7b188e031c11.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/68fbbd17c89f03dbb61cd6ffdb9a0344.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/60ef95894ceebaf236170e8832dcf7e3.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2a30f3a8b673cc28bd90c50cf1a35281.png)
![](https://img.xkw.com/dksih/QBM/2022/1/17/2896444928491520/2952914141020160/STEM/d96c5afe-465b-4ad6-9e7b-f36612488c1b.png?resizew=152)
(1)求证:
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e6e490f703eb6c9bb1278c78ebc2d661.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/3d97cdc586744d208b6f69c9813af977.png)
(2)若
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0761165f1176f3a5fe4f7b052832316d.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/6a19338598965bb3856cdd0236bbf694.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/03902478df1a55bc99703210bccab910.png)
您最近一年使用:0次
解答题-证明题
|
适中
(0.65)
名校
【推荐2】如图,点
在以
为直径的
上,
平分
,且
于点
.
是
的切线;
(2)若
,
,求
的半径.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c5db41a1f31d6baee7c69990811edb9f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f52a58fbaf4fea03567e88a9f0f6e37e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/3d97cdc586744d208b6f69c9813af977.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/60ef95894ceebaf236170e8832dcf7e3.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2947ca8e0cdbeb4aab80ce9e7b63ba98.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/cdb2dd10731b99c0f4f89ee957f8a239.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/8455657dde27aabe6adb7b188e031c11.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9e52a8f07834cbbbe4224962672fbbb2.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/3d97cdc586744d208b6f69c9813af977.png)
(2)若
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/fc11331a7b2d2619b40ee6d34c3bd620.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/833cfda415649b832cc136caed392753.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/3d97cdc586744d208b6f69c9813af977.png)
您最近一年使用:0次
解答题-问答题
|
适中
(0.65)
名校
【推荐1】如图,小敏在参观大风车时;想测一下风叶AB的长度.她首先通过C处的铭牌简介得知每个风车杆子BC的高度为98米,然后沿水平方向走到D处,再沿着斜坡DE走了35米到达E处观察风叶的转动,当风叶AB转到如图铅垂方向时测得点A的仰角为68°;当风叶AB转到如图水平方向
时测得点
的仰角为45°,若斜坡DE的坡度
,小敏身高忽略不计;(参考数据:
,
,
)
![](https://img.xkw.com/dksih/QBM/editorImg/2022/9/17/8d260f9c-f152-4d83-bdee-fdaa207c71ce.png?resizew=143)
(1)求D到E的过程中上升的竖直高度;
(2)求风叶AB的长度.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e663220a66eff19da6a71e46b397db2e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e7c314398e26ffc7164b82946eeb4273.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c6bd21e21aa61426fbf90367f86e0f0f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f2dbbfd9a7e979216916442c698857db.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ab9c0d3acbd596900d1fbea65fa7940a.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/674e15f2adcd5bd334a9566beb107762.png)
![](https://img.xkw.com/dksih/QBM/editorImg/2022/9/17/8d260f9c-f152-4d83-bdee-fdaa207c71ce.png?resizew=143)
(1)求D到E的过程中上升的竖直高度;
(2)求风叶AB的长度.
您最近一年使用:0次
解答题-问答题
|
适中
(0.65)
【推荐2】如图,斜坡AB的长为65米,坡度i=1∶2.4,BC⊥AC.
![](https://img.xkw.com/dksih/QBM/2020/6/3/2476517624356864/2477244501164032/STEM/a52b322c1d874a799e93753f51a7de4b.png?resizew=256)
(参考三角函数:sin37°≈
,cos37°≈
,tan37°≈
)
(1)求斜坡的高度BC.
(2)现计划在斜坡AB的中点D处挖去部分坡体,修建一个平行于水平线CA的平台DE和一条新的斜坡BE,若斜坡BE的坡角为37°,求平台DE的长.
![](https://img.xkw.com/dksih/QBM/2020/6/3/2476517624356864/2477244501164032/STEM/a52b322c1d874a799e93753f51a7de4b.png?resizew=256)
(参考三角函数:sin37°≈
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7ec5efba5a2b7fb879ffd79fcf73ff03.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ba564f8149fb98ee50c4012f06708382.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d33d78f02558d84c57e7db6d9c0221ba.png)
(1)求斜坡的高度BC.
(2)现计划在斜坡AB的中点D处挖去部分坡体,修建一个平行于水平线CA的平台DE和一条新的斜坡BE,若斜坡BE的坡角为37°,求平台DE的长.
您最近一年使用:0次