如图,小明在公园放风筝,拿风筝线的手
离地面高度
为
,风筝飞到
处时的线长
为
,这时测得
,求此时风筝离地面的高度.(精确到
,
)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7f9e8449aad35c5d840a3395ea86df6d.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f52a58fbaf4fea03567e88a9f0f6e37e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f6244c4be2c661dc2166885d65bbad9c.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c5db41a1f31d6baee7c69990811edb9f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0dc5c9827dfd0be5a9c85962d6ccbfb1.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e1611d15c7e1e4ab4a4a61537b3989d8.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a6004eee4a174dcbd264717758c8bc83.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/bfaa19eeaf415ed419e77fe92794f443.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/382122a69d7a497aaf308f02b6a81add.png)
![](https://img.xkw.com/dksih/QBM/editorImg/2023/7/31/dec59e51-738b-4db3-a132-dc0e88174289.png?resizew=144)
更新时间:2023-07-30 16:02:06
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解答题-证明题
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名校
【推荐1】如图,在
中,
,
平分
交
于点
,点
在
上,以点
为圆心,
为半径的圆恰好经过点
,交
于点
.
![](https://img.xkw.com/dksih/QBM/editorImg/2022/6/16/3fdd82d2-8f0e-43cc-9386-d3409a7dce96.png?resizew=260)
(1)求证:
是
的切线;
(2)若
,
,求
的长.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/dd967903ed5a6f640a5b801ec8be0070.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/8f89deb952f57f4b3fa4887b098b7b91.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d40b319212a7e7528b053e1c7097e966.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d39b8d91afc34e4a9b0fdbb6bafb9087.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/60ef95894ceebaf236170e8832dcf7e3.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/8455657dde27aabe6adb7b188e031c11.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/1dde8112e8eb968fd042418dd632759e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0dc5c9827dfd0be5a9c85962d6ccbfb1.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/1dde8112e8eb968fd042418dd632759e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b90e0f35eda1a729fed485f83da5ea9d.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/8455657dde27aabe6adb7b188e031c11.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f52a58fbaf4fea03567e88a9f0f6e37e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2a30f3a8b673cc28bd90c50cf1a35281.png)
![](https://img.xkw.com/dksih/QBM/editorImg/2022/6/16/3fdd82d2-8f0e-43cc-9386-d3409a7dce96.png?resizew=260)
(1)求证:
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/60ef95894ceebaf236170e8832dcf7e3.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/3d97cdc586744d208b6f69c9813af977.png)
(2)若
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/8b42602dabcdc7bdaba0ee0af37d71f0.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/fc11331a7b2d2619b40ee6d34c3bd620.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/68a83fdd2ba72a2dba0b6b10bb3e06b9.png)
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解答题-问答题
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【推荐2】如图,教学楼AB与旗杆CD的距离BC=12m,O在AB上,且OB= 1.5m,在某次数学活动课中,甲小组在A测得旗杆顶部D的俯角为30°,同时乙小组从0处测得旗杆顶部D的仰角为38.7°,求教学楼AB的高度(精确到0.1m),(参考数据::sin38.7°≈0.63,cos38.7≈0.78,tan38.7°=0.80,
=1.73)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a7ffe8515ff6183c1c7775dc6f94bdb8.png)
![](https://img.xkw.com/dksih/QBM/2022/4/15/2958580347797504/2959548068372480/STEM/700fac9c-fc52-49b8-8a45-f9de49be8363.png?resizew=192)
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【推荐1】如图,光明中学九年级(2)班的同学用自己制作的侧倾器测量该校旗杆的高度,已知测倾器CD的高度为1.54米,测点D到旗杆的水平距离BD=20米,测得旗杆顶A的仰角α=35°,求旗杆AB的高度(精确到0.01米).
![](https://img.xkw.com/dksih/QBM/2019/2/28/2150271349350400/2154903754342400/STEM/9ab9af6b878143e6a8bb18c576e06450.png?resizew=140)
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【推荐2】如图1 是位于西安市的具有“西北第一高”称号的摩天轮,它的“成像效果”全球第一.图2是它的简化示意图,点O是摩天轮的圆心,
是摩天轮垂直地面的直径,小颖想利用数学知识实地测量该摩天轮的高度,她在A 处测得摩天轮顶端M的仰角为
,接着沿水平方向向左行走 140 米到达点 B,再沿着坡度
的斜坡走了20 米到达点 C,最后再沿水平方向向左行走40米到达摩天轮最低点N处(A,B,C,M,N均在同一平面内),求摩天轮
的高度.(结果精确到1 米)(参考数据:
)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/411461db15ee8086332c531e086c40c7.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a7b398c95494eddc79939f16e66cf4da.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/cbee6e595ad1697df091ed7d871d7013.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/411461db15ee8086332c531e086c40c7.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f15553d2ff3dc96fae26c4d513ffa57f.png)
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