名校
解题方法
1 . 如图所示,在河对岸有两座垂直于地面的高塔
和
.小明在只有量角器(可以测量从测量人出发的两条射线的夹角)和直尺(可测量步行可抵达的两点之间的直线距离)且不渡过河的条件下,为了计算塔
的高度,他在点
测得点
的仰角为
,
,又选择了相距100米的
点,测得
.
![](https://img.xkw.com/dksih/QBM/editorImg/2022/12/23/6f052b58-b2b1-4061-8d80-b68fdc88b36d.png?resizew=185)
(1)请你根据小明的测量数据求出塔
高度;
(2)在完成(1)的任务后,小明想要计算两塔顶之间的距离
,在测得
之后,小明准备再测量两个角的大小,并为此准备了如下四个方案:
方案①:测量
和
方案②:测量
和![](https://staticzujuan.xkw.com/quesimg/Upload/formula/1e31edc5b71c488ca9942d70d9298f01.png)
方案③:测量
和
方案④:测量
和![](https://staticzujuan.xkw.com/quesimg/Upload/formula/36719f1e764ee0e719b65c49fae84677.png)
请问:小明的备选方案中有哪些是可行的?写出所有可行方案的序号;
(3)选择(2)中的一种方案,并结合以下数据,计算出两塔顶
之间的距离,精确到米.
,
,
,
,
,
.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9d78abbad68bbbf12af10cd40ef4c353.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/49b50357a6545cae8348e3059312f520.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9d78abbad68bbbf12af10cd40ef4c353.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5963abe8f421bd99a2aaa94831a951e9.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/8455657dde27aabe6adb7b188e031c11.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f6b86c22b670a8e9f3896f9e8883fbbb.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7142383d6de5773d8be46e6f98cb4ac0.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7f9e8449aad35c5d840a3395ea86df6d.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e075468e7fb0bf30229aec01a7205977.png)
![](https://img.xkw.com/dksih/QBM/editorImg/2022/12/23/6f052b58-b2b1-4061-8d80-b68fdc88b36d.png?resizew=185)
(1)请你根据小明的测量数据求出塔
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9d78abbad68bbbf12af10cd40ef4c353.png)
(2)在完成(1)的任务后,小明想要计算两塔顶之间的距离
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d004d2d115b477ade6af7ddb93db0df8.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/01e94dacf9ef98c98de9344a77079cf5.png)
方案①:测量
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/3d786ee723231d4ca87eb9d011a378b5.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7c36ff76f9f1ee12db562cde7a58b8c3.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2cfc2771aa0d5b97d2297f8a26a6f6b1.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/1e31edc5b71c488ca9942d70d9298f01.png)
方案③:测量
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2cfc2771aa0d5b97d2297f8a26a6f6b1.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/beb3748300134501953d6b1c3a905026.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/3d786ee723231d4ca87eb9d011a378b5.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/36719f1e764ee0e719b65c49fae84677.png)
请问:小明的备选方案中有哪些是可行的?写出所有可行方案的序号;
(3)选择(2)中的一种方案,并结合以下数据,计算出两塔顶
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d004d2d115b477ade6af7ddb93db0df8.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0e7cfbcdbb5fdd552563b0d6fb40a575.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d6ade009e169085eabc56e007e55cfbb.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/aa17d54f4bf94ee512f197b15d989223.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/493c9cd7c87c96a5f9d2157302b3ede6.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f93ac836bfccc1a02cb23921d67c9e16.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ee04584aacca686baedbbc9eea6d7478.png)
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2021-07-19更新
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299次组卷
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3卷引用:上海市实验学校2020-2021学年高一下学期期末数学试题