如图,直线
,
的顶点B在
上,若
,则
的度数为______ .
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ad93bdc4f5a8ac154d8084080ccf1d82.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/dd967903ed5a6f640a5b801ec8be0070.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/274cf35acb4a1748d15c39d15a9bea7b.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/afa11013a8c200f32789db47e0343535.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9d3e081637bcea5368cc72370bae283b.png)
更新时间:2024-04-18 15:49:44
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【推荐1】如图,AB是⊙O的直径,点C、D是AB两侧⊙O上的点,若∠CAB=34°,则∠ADC=_____ °.
![](https://img.xkw.com/dksih/QBM/2022/1/3/2886297628975104/2886681018671104/STEM/9f310d7d-5d48-4261-9842-fff17185d0b9.png?resizew=185)
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【推荐2】已知∠A=68°48′,则∠A的余角的度数是_____ .
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【推荐1】如图,从热气球C上测得两建筑物A、B底部的俯角分别为29.5°和45°,如果这时气球的高度CD为100米,则建筑物A、B之间的距离为_____ (结果精确到1米).[参考数据:sin29.5°≈0.49,cos29.5°≈0.87,tan29.5°≈0.57]
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【推荐2】把一块含
角的直角三角尺
(其中
)按下图所示的方式摆放在两条平行线
之间.
(1)如图1,若三角形的
角的顶点
落在
上,且
,则
的度数为__________ .
(2)如图2,若把三角尺的直角顶点
放在
上,
角的顶点
落在
上,则
与
的数量关系为__________ .
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/be6a6301878fed2a01413020b27310a5.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ffe8a84ca3a13f82aff1a022edc66065.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f01c9b07ac1a094791272760c9d163b4.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f9b79c80cc81b5446dfac3ee97b03c03.png)
![](https://img.xkw.com/dksih/QBM/editorImg/2023/9/5/f9e01b25-3ce8-4e88-899a-f1835a3bfffd.png?resizew=298)
(1)如图1,若三角形的
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/be6a6301878fed2a01413020b27310a5.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/895dc3dc3a6606ff487a4c4863e18509.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9d78abbad68bbbf12af10cd40ef4c353.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/02bb02c6af3a9deed43b7a0f1dac657c.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d5b69d40b75d582c4b8ffa2369af1d41.png)
(2)如图2,若把三角尺的直角顶点
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a0ed1ec316bc54c37c4286c208f55667.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9d78abbad68bbbf12af10cd40ef4c353.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f6b86c22b670a8e9f3896f9e8883fbbb.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2a30f3a8b673cc28bd90c50cf1a35281.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f52a58fbaf4fea03567e88a9f0f6e37e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/482e68d608de7675e15bb759acd8204c.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/76ee4e24fdbe22a139a9dee636f76182.png)
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