如图,
平分正五边形
的外角
,并与
的平分线交于点O,则
的度数为( )
![](https://img.xkw.com/dksih/QBM/editorImg/2022/8/16/8cdc7e0d-d458-4530-b89e-d697fb9a590d.png?resizew=179)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/abf80148409afb32ced0b4f59f1ba709.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9142a8490de14a87eda628ffa7e28982.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/300d3ec6447250bb25915ae86873929a.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a852c13de65877be1f43ac1f88f179d7.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b09bf6ba623953df55eb869b2b363e39.png)
![](https://img.xkw.com/dksih/QBM/editorImg/2022/8/16/8cdc7e0d-d458-4530-b89e-d697fb9a590d.png?resizew=179)
A.![]() | B.![]() | C.![]() | D.![]() |
2021·山东烟台·二模 查看更多[8]
更新时间:2021-05-09 10:38:26
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【推荐1】如图,
是
的角平分线,
,若
,则
的度数为( )
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/6aa2b5e09f8ec785c59900a529390a02.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7cbce11aa19b8bd2bf6ee5a834e005de.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c5b3f839ce88bf970aceb44ab939bd5b.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/8adaf66bf642e8b8938dd344ac3febed.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d5b69d40b75d582c4b8ffa2369af1d41.png)
![](https://img.xkw.com/dksih/QBM/editorImg/2023/10/23/3ca1ce1f-7746-45b5-91b2-49a50f02658d.jpg?resizew=119)
A.![]() | B.![]() | C.![]() | D.![]() |
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【推荐2】如图,在
中,
,
,
平分
,若
,则
的长为( )
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/dd967903ed5a6f640a5b801ec8be0070.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0f3018c687427b6257767eda4a8c6612.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7e3262fc038bbec5e7c8cc47df08bef7.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d40b319212a7e7528b053e1c7097e966.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d39b8d91afc34e4a9b0fdbb6bafb9087.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/833cfda415649b832cc136caed392753.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f52a58fbaf4fea03567e88a9f0f6e37e.png)
A.4 | B.8 | C.![]() | D.![]() |
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【推荐1】如图,将四边形
剪掉一个角得到五边形.下列判断正确的是( )
结论①:变成五边形后外角和不发生变化;
结论②:变成五边形后内角和增加了
;
结论③:通过图中条件可以得到
;
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/411b38a18046fea8e9fab1f9f9b80a5f.png)
结论①:变成五边形后外角和不发生变化;
结论②:变成五边形后内角和增加了
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/1b2ccc34a8b3cf908af78bdbe804afac.png)
结论③:通过图中条件可以得到
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/42e4fd9651eed82798a338831b15a325.png)
A.只有①对 | B.①和③对 | C.①、②、③都对 | D.①、②、③都不对 |
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【推荐2】已知三角形的三个外角的度数比为 2:3:4,则它的最小内角的度数是( )
A.20° | B.40° | C.60° | D.80° |
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