小明的爸爸是测绘员,元旦期间,小明和爸爸带着经纬仪和无人机一起去郊外进行测绘实践活动,已知经纬仪的高度为1.5米.
活动一:
如图1,小明在点
处安置经纬仪,测得
与水平线的夹角
,
米,则点
与点
的高度差为________米.
活动二:
小明想继续测量山坡两侧点
与点
的高度差,但因山坡的遮挡,两点无法用眼睛直接观测到,小明寻求爸爸的帮助,爸爸画出如图2所示的测绘图纸,在点
,
处分别安置经纬仪,将无人机悬停到遮挡区域上空,测得
与水平线的夹角
,
与水平线的夹角
,
米,
米.请你根据以上数据求点
与点
的高度差.(参考数据:
,
,
,
)
![](https://img.xkw.com/dksih/QBM/editorImg/2024/1/26/2df6ca18-0031-4421-a650-a017b9baced6.png?resizew=320)
活动一:
如图1,小明在点
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5963abe8f421bd99a2aaa94831a951e9.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9d78abbad68bbbf12af10cd40ef4c353.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/07c0a61e30802d1aeed49a6b26ff31b3.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ff2dcf2debb4c733c88061662bd22a02.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/8455657dde27aabe6adb7b188e031c11.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5963abe8f421bd99a2aaa94831a951e9.png)
活动二:
小明想继续测量山坡两侧点
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/54a5d7d3b6b63fe5c24c3907b7a8eaa3.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ac047e91852b91af639feec23a9598b2.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ac047e91852b91af639feec23a9598b2.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/54a5d7d3b6b63fe5c24c3907b7a8eaa3.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/4505508b3e36db64a207dcdaf8eb22dc.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c6405b2ce77b8b85b36e723fe00b9e13.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/55bb0405afa96ebf94c5b03fd52763dd.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e304418c6488c968ad1ac6c360fa4254.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/babcc4293779ff647ec9ffae2e2f0fcd.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5e98155207c398edd190060e2b208da2.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/54a5d7d3b6b63fe5c24c3907b7a8eaa3.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ac047e91852b91af639feec23a9598b2.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/888e6e9e6ca20554cc98547b1a3f8bb0.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f04390bfdcc0c4707fd43a2c0b6a585f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a3c2d2db1fa8a6c703c6edecfa038d85.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/09e47e722487ac9e321836d41303819a.png)
更新时间:2024-01-26 21:34:31
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名校
【推荐1】如图,已知圆O的直径AB垂直于弦CD于点E,连接CO并延长交AD于点F,且CF⊥AD.
(1)证明:点E是OB的中点;
(2)若AB=8,求CD的长.
![](https://img.xkw.com/dksih/QBM/editorImg/2023/12/10/849e1933-fdd4-4b98-a238-ad87f6f11b05.png?resizew=117)
(1)证明:点E是OB的中点;
(2)若AB=8,求CD的长.
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【推荐2】定义:若两个三角形有一对公共边,且另有一组对应边和一对对应角分别对应相等,那么这两个三角形称为邻等三角形.例如:如图1,
中,
,
,
,则
与
是邻等三角形.
![](https://img.xkw.com/dksih/QBM/editorImg/2023/12/29/a884bd3d-4e6f-4f7a-bd2d-38827232c267.png?resizew=628)
(1)如图2,
中,点D是
的中点,那么请判断
与
是否为邻等三角形,并说明理由.
(2)如图3,以点
为圆心,
为半径的
交
轴于点
,
是
的内接三角形,
.求
的度数和
的长.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/15c0dbe3c080c4c4636c64803e5c1f76.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/8c4c21c9a2127457c296b9e11b3ea656.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/047dc9795efa99b6fb9fdf9778085dab.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e4354365ca0929f8a606ed0bf341e4ca.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ab2a2834d80ff574e79eae8ca8d4e94f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7ac451db3443cabb204f96c31fd4a02e.png)
![](https://img.xkw.com/dksih/QBM/editorImg/2023/12/29/a884bd3d-4e6f-4f7a-bd2d-38827232c267.png?resizew=628)
(1)如图2,
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/3d97cdc586744d208b6f69c9813af977.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ed41d321f4c0717ac5b443aad942d9a7.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ab2a2834d80ff574e79eae8ca8d4e94f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7ac451db3443cabb204f96c31fd4a02e.png)
(2)如图3,以点
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/000c5734cbc399e18f1527145ab4cd29.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ef4113c492885ba7c47fe42ac792578f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/3c20d0b44025a639ce3a92d639dae587.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/81dea63b8ce3e51adf66cf7b9982a248.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/bcf982e2547498e78cd6b95f5bcaaa62.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ebcc52a06d806fde891e09a0a389fcd4.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/3c20d0b44025a639ce3a92d639dae587.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/744f6cde9d70c3e27c36e4ffec81b9c6.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/194741f4d2ae7ee44cafca780361446a.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/828628c0876b45381c9a0edeb0fec236.png)
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【推荐1】李明同学用自己学到的知识测量某古塔的高度,他利用测角仪在点C处测得塔顶A的仰角
,在点E处测得此时塔顶A的仰角
(B,F,D三点在同一条直线上),测角仪
的高为1.5米,
的水平距离为30米,求古塔的高
.(精确到0.1米,参考数据:
,
,
,
)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/54a770a134577888fe25015d0f8b22bd.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/05a217843049225cc20d5c15101f6194.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9d78abbad68bbbf12af10cd40ef4c353.png)
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![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f52a58fbaf4fea03567e88a9f0f6e37e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c9a91a2e16d99be281879fe0cfc8065c.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/70f874fd571efc2b771dabe422a50e00.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ed5a6f5cab605a6e552294472cffef51.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/460317e7c26f95b9b29cfe1a89b796d6.png)
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【推荐2】公园草坪上有一架秋千
,秋千静止时,底端
到地面的距离
为
,从竖直位置开始,向右可摆动的最大夹角为
,已知秋千的长
.
(1)如图1,当向右摆动到最大夹角时,求
到地面的距离;
(2)如图2,若有人在
点右侧搭建了一个等腰
帐篷,已知
,帐篷的高
为
,秋千摆动的过程中是否会撞到帐篷?若不会撞到,请说明理由;若会撞到,则帐篷应该向右移动超过多少米才能不被撞到?
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ef4113c492885ba7c47fe42ac792578f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5963abe8f421bd99a2aaa94831a951e9.png)
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![](https://img.xkw.com/dksih/QBM/editorImg/2023/6/2/aeff6b3e-0a58-4526-9343-2e64e037098c.png?resizew=394)
(1)如图1,当向右摆动到最大夹角时,求
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e7c314398e26ffc7164b82946eeb4273.png)
(2)如图2,若有人在
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7f9e8449aad35c5d840a3395ea86df6d.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/177678001b2ccde1db8f57fa5e017002.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a01eefba3a8d75b6c0da0bed9040953e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/35d58f9019097bd05037aefd5c322916.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d251c330f4e4aef84fb008bd80f1b09e.png)
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【推荐1】如图,明亮同学在点A处测得大树顶端C的仰角为36°,斜坡AB的坡角为30°,沿在同一剖面的斜坡AB行走16米至坡顶B处,然后再沿水平方向行走6.4米至大树脚底点D处,那么大树CD的高度约为多少米?)(参考数据:sin36°≈0.59,cos36°≈0.81,tan36°≈0.73,
≈1.7).
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5c3f8c3ba00c59e0634ed10fa85289de.png)
![](https://img.xkw.com/dksih/QBM/2019/1/3/2110959847596032/2113769127010304/STEM/3aee62c743754aae926aee111f5da1ab.png?resizew=165)
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【推荐2】如图,某水渠的横断面是以
为直径的半圆O,其中水面截线
,小明在A处测得点B处小树的顶端C的仰角为
,已知小树的高为
米.
的长;
(2)如果要使最大水深为2.8米,那么此时水面的宽度
约为多少米.(结果精确到0.1米,参考数据:
,
)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f52a58fbaf4fea03567e88a9f0f6e37e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d6cc9f041724e7fa6b08c717de02fc9d.png)
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![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f52a58fbaf4fea03567e88a9f0f6e37e.png)
(2)如果要使最大水深为2.8米,那么此时水面的宽度
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/411461db15ee8086332c531e086c40c7.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b4861ce747bb5e6e75f96060f6b875e0.png)
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