如题图,一座塔建在山坡上,塔身与水平面垂直,现测得塔身与山坡坡面所成的锐角为
,则此山坡的坡面与水平面夹角
的度数为______ .
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9c5b696c0ca68ec19b9127c1675051f8.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/780d8fd6c6c1deeeb45e15f639719e02.png)
更新时间:2024-05-08 13:18:39
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较易
(0.85)
【推荐2】已知:如图,在三角形ABC中,
于点D,连接DE,当
时,求证:DE
BC.
证明:∵
(已知),
∴
(垂直的定义).
∴![](https://staticzujuan.xkw.com/quesimg/Upload/formula/905ecf82a44cd281df7ff71fa572ab74.png)
________
,
∵
(已知),
∴________
(依据1:________ ),
∴
(依据2:________ ).
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/8b757f0c42ae5c9a2d6a4b19e5877b27.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/4bc6da80c5843d23ee18f3dfb709849d.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2a9bfa68259d7a331be323b2038d628a.png)
证明:∵
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/8b757f0c42ae5c9a2d6a4b19e5877b27.png)
∴
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/4795ee1f96b430529934e2231b38885d.png)
∴
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/905ecf82a44cd281df7ff71fa572ab74.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b0c06422e1d55db3077257af113df4bb.png)
∵
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/4bc6da80c5843d23ee18f3dfb709849d.png)
∴
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d32d041058f48c2c3c12b6fda4f7675e.png)
∴
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c436f108fd4921dae15ecff19270237e.png)
![](https://img.xkw.com/dksih/QBM/2022/1/6/2888596497276928/2889354326958080/STEM/571a0ccff2f2481395423f0397f6add6.png?resizew=148)
您最近一年使用:0次
填空题
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较易
(0.85)
【推荐1】如图,AB∥CD,直线EF分别交AB,CD于点E,F,EG平分∠BEF,若∠EFG=64°,则∠EGD的大小是________ .
![](https://img.xkw.com/dksih/QBM/editorImg/2022/10/28/a1de4c9c-0b22-45df-a335-9ce3816a1b84.png?resizew=146)
您最近一年使用:0次