1 . 如图,在山脚
测得山顶
的仰角为
,沿倾斜角为
的斜坡向上走
米到
,在
出测得山顶
得仰角为
,
,求坡面的坡比.(坡比是坡面的垂直高度与水平宽度的比值)
(2)求证;山高
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5963abe8f421bd99a2aaa94831a951e9.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/dad2a36927223bd70f426ba06aea4b45.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e170f206fdbbd834aad7580c727e2cc6.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5b5858ee1ce52b251816757257a11c29.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0a6936d370d6a238a608ca56f87198de.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7f9e8449aad35c5d840a3395ea86df6d.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7f9e8449aad35c5d840a3395ea86df6d.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/dad2a36927223bd70f426ba06aea4b45.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9f435efcc7869eec21bdba1ed81dc3f5.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5a3f9f6f08449a598c3a4e156bdcec45.png)
(2)求证;山高
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c1582059edd9bd52b77b5f8a97c2039a.png)
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2 . 已知四棱锥
中,
,
,
,
,
,![](https://staticzujuan.xkw.com/quesimg/Upload/formula/bb7b2c28becbbb5981d5c7b126430011.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ef9b7b94d209c2fcd994da684869ca80.png)
(2)求直线PC与平面PBD所成角的正弦值.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0585b6c0f156eecf9662b9846d4eb693.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/4e52411c8437d0640c5b3d87cf5ebebb.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/080db3af81b29ed10144a1c2e2a4fb8a.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/82465b63174087aeba7788ed984583d2.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/08ad8d16722f5b9e7fd2602f14d5ffbe.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e99998f33ad6edab18180627d4903dcc.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/bb7b2c28becbbb5981d5c7b126430011.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ef9b7b94d209c2fcd994da684869ca80.png)
(2)求直线PC与平面PBD所成角的正弦值.
您最近一年使用:0次
2022-11-14更新
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3034次组卷
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