“小房子”是一种常见的牛奶包装盒(如图1),图2是其一个侧面的示意图,由“盒身”矩形
和“房顶”等腰三角形
组成.已知
厘米,
厘米,
厘米.
的距离;
(2)现设计了牛奶盒的一个新造型,和原来相比较,折线段
的长度(即线段
与
的和)及矩形
的面积均不改变,且
,
,求新造型“盒身”的高度(即线段
的长).
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2fa7bbd7831e9ff4f8cffc8889d34f05.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c09afc70f448545336304333d5b5658b.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/eafaa53c04502ee12340c131397aa2e0.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/de8cc58ef27567f0ab06eb1012aec330.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f6082bd9a1d6d8ce3fdb9fc5d4f0ada1.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9d78abbad68bbbf12af10cd40ef4c353.png)
(2)现设计了牛奶盒的一个新造型,和原来相比较,折线段
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7bef5239ddbb0972700ce01daf9ee7cf.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/2fa7bbd7831e9ff4f8cffc8889d34f05.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ce37146834bf9fed61e75c7a61a6b472.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/58db8d0f5739082af0faf9f94362e22e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0dc5c9827dfd0be5a9c85962d6ccbfb1.png)
2023·上海宝山·二模 查看更多[4]
2023年上海市宝山区中考二模数学试题(已下线)第13讲 解直角三角形的应用-【暑假自学课】2023年新九年级数学暑假精品课(沪教版,上海专用)(已下线)热点08 解直角三角形(11大题型+满分技巧+限时分层检测)-2024年中考数学【热点·重点·难点】专练(上海专用)(已下线)专题08 锐角的三角比(4大热点题型)(含24年上海最新模拟题)-2024年中考数学毕业班二轮热点题型归纳与变式演练(上海专用)
更新时间:2023-04-29 16:26:11
|
【知识点】 其他问题(解直角三角形的应用)
相似题推荐
解答题-问答题
|
适中
(0.65)
真题
【推荐1】美丽的黄河宛如一条玉带穿城而过,沿河两岸的滨河路风情线是兰州最美的景观之一.数学课外实践活动中,小林在南滨河路上的A,B两点处,利用测角仪分别对北岸的一观景亭D进行了测量.如图,测得∠DAC=45°,∠DBC=65°.若AB=132米,求观景亭D到南滨河路AC的距离约为多少米?(结果精确到1米,参考数据:sin65°≈0.91,cos65°≈0.42,tan65°≈2.14)
![](https://img.xkw.com/dksih/QBM/2017/8/1/1773762783387648/1773762783715328/STEM/cb0efa4343294a3e9e5c739d670fdcff.png?resizew=364)
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解答题-证明题
|
适中
(0.65)
名校
【推荐2】水车又称孔明车,是中国最古老的农业灌溉工具,是先人们在征服世界的过程中创造出来的高超劳动技艺,是珍贵的历史文化遗产.相传为汉灵帝时毕岚造出雏形,经三国时孔明改造完善后在蜀国推广使用,隋唐时广泛用于农业灌溉,已有1700余年历史.小明对水车进行了研究,如图,水渠
与水车
相切于点
,连接
,已知
的半径为
米,支柱
、
与水面
垂直,支柱
的高度为
米,点
与点
之间的距离为
米,点
,
,
,
,
在同一平面内.
![](https://img.xkw.com/dksih/QBM/editorImg/2023/5/16/adf114f5-ae17-4620-b2ab-6d6aabe83f34.png?resizew=355)
(1)求证:
.
(2)实践中发现,水渠
与支柱
的夹角
大小为
时,水车装置较为牢固稳定,请计算支柱
的高度.(结果要求精确到0.1,参考数据:
,
,
)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9d78abbad68bbbf12af10cd40ef4c353.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/71b63d2504bd3ecce8c10560b142356f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/3d97cdc586744d208b6f69c9813af977.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/bd7c304b64435d1697c1ea29efe08fb0.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ef4113c492885ba7c47fe42ac792578f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0dc5c9827dfd0be5a9c85962d6ccbfb1.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f52a58fbaf4fea03567e88a9f0f6e37e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ef4113c492885ba7c47fe42ac792578f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/22d3bf727f6c78896544c7f6c8ff33ba.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5963abe8f421bd99a2aaa94831a951e9.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7f9e8449aad35c5d840a3395ea86df6d.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/900206075ce8f1f040d2e3a6685ad51a.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/1dde8112e8eb968fd042418dd632759e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5963abe8f421bd99a2aaa94831a951e9.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7f9e8449aad35c5d840a3395ea86df6d.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c5db41a1f31d6baee7c69990811edb9f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/8455657dde27aabe6adb7b188e031c11.png)
![](https://img.xkw.com/dksih/QBM/editorImg/2023/5/16/adf114f5-ae17-4620-b2ab-6d6aabe83f34.png?resizew=355)
(1)求证:
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a6e96ae4c87c2eec30b3b1a8281a0a02.png)
(2)实践中发现,水渠
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9d78abbad68bbbf12af10cd40ef4c353.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0dc5c9827dfd0be5a9c85962d6ccbfb1.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/727ad3e630a224303d6d3b8ad5c114ba.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/befcc55f986eca8de7d834308a55f4fa.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0dc5c9827dfd0be5a9c85962d6ccbfb1.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/3c3923b3b007215879fc834fb2615393.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f74c1277e1931cf183fde2ca8c5f60f5.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/8dddef41554a631436c61aff923bde06.png)
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