如图,正五边形
内接于
,点P为弧
上一点,则
的为度数为( )
![](https://img.xkw.com/dksih/QBM/2022/12/28/3140575483904000/3143960993447936/STEM/66e0535df7e24785b1e8237fc12eeb72.png?resizew=156)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9142a8490de14a87eda628ffa7e28982.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/3d97cdc586744d208b6f69c9813af977.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/863f827f57e537232920797b5556d044.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ac3c1375c64dceef45846308a418cf7f.png)
![](https://img.xkw.com/dksih/QBM/2022/12/28/3140575483904000/3143960993447936/STEM/66e0535df7e24785b1e8237fc12eeb72.png?resizew=156)
A.![]() | B.![]() | C.![]() | D.![]() |
更新时间:2023-01-02 08:27:55
|
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【推荐1】如图,平面上两个正方形与正五边形都有一条公共边,则
的度数为( )
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e170f206fdbbd834aad7580c727e2cc6.png)
![](https://img.xkw.com/dksih/QBM/editorImg/2023/8/9/b4baec72-325f-47dd-8a7e-89dea46ade37.png?resizew=119)
A.![]() | B.![]() | C.![]() | D.![]() |
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【推荐2】将一副直角三角板与正五边形按如图所示的方式摆放.如果
,那么
等于( )
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/19a0132a49bb95a4dfc76215b79a0c38.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/605f2976297a0deaa1602ef09d6a5afa.png)
![](https://img.xkw.com/dksih/QBM/editorImg/2023/10/4/4a0508d3-639e-4a9a-9abd-13c2a02db482.png?resizew=108)
A.![]() | B.![]() | C.![]() | D.![]() |
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【推荐1】晚自习时,小敏和小聪在讨论一道题目:“已知点O为△ABC的外心,∠BOC=126°,求∠A.”,小敏的解答为:画△ABC以及它的外接圆O,连结OB,OC,如图.由∠BOC=2∠A=126°,得∠A=63°.而小聪说:“小敏考虑的不周全,∠A还应有另一个不同的值.”,下列判断正确的是( )
![](https://img.xkw.com/dksih/QBM/editorImg/2024/3/25/fc5e7441-0d84-4f23-ae5f-f015e87dd2de.png?resizew=135)
![](https://img.xkw.com/dksih/QBM/editorImg/2024/3/25/fc5e7441-0d84-4f23-ae5f-f015e87dd2de.png?resizew=135)
A.小敏求的结果不对,∠A应得54° |
B.小聪说的不对,∠4就得63° |
C.小聪说的对,且∠A的另一个值是117° |
D.两人都不对,∠A应有3个不同值 |
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【推荐2】如图,
内接于
,
,
,
为
的直径,
,则
长为( )
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/15c0dbe3c080c4c4636c64803e5c1f76.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/3d97cdc586744d208b6f69c9813af977.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0fffa3d9c32da53b0ea0c338012ea20c.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/047dc9795efa99b6fb9fdf9778085dab.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d40b319212a7e7528b053e1c7097e966.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/3d97cdc586744d208b6f69c9813af977.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/267ace52b64e1e7dfc5211e033255b7d.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0dc5c9827dfd0be5a9c85962d6ccbfb1.png)
![](https://img.xkw.com/dksih/QBM/editorImg/2023/10/12/70e5a5e1-db94-4859-85a1-0040ccc9a337.png?resizew=128)
A.4 | B.![]() | C.6 | D.![]() |
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