正六边形可以看成由基本图形_________ 经过 _______ 次旋转而成.
17-18九年级上·全国·课后作业 查看更多[4]
人教版九年级上册数学 23.1图形的旋转(2)练习人教版九年级上册数学 第23章小结与复习 练习华东师大版七年级数学下册第10章轴对称、平移与旋转单元检测试题(已下线)专题23.2 图形的旋转(基础篇)(专项练习)-2022-2023学年九年级数学上册基础知识专项讲练(人教版)
更新时间:2017-12-04 14:08:56
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【推荐1】正六边形
内接于
的半径为1,则由半径
和
围成的扇形的面积为______ .
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9165d9bfbb0f0d19eb482c2a4c1b29b7.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c0373dc9b26a85c00882358a941d53f6.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/06ae1d6c499236dd23f7c78e5f78d1cc.png)
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【推荐2】如图,半径为2的圆内接正八边形
的中心为O,连接
,![](https://staticzujuan.xkw.com/quesimg/Upload/formula/84d892bfdcefb4ec529bc5ac0fa321d3.png)
______ °,![](https://staticzujuan.xkw.com/quesimg/Upload/formula/3247cb0a30c81a66a03c93c26d39eec1.png)
______ .
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b7c85329eca5855dee9082ac7d6ae4be.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/20f60fb43531bb428ab2571ec5236318.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/84d892bfdcefb4ec529bc5ac0fa321d3.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/3247cb0a30c81a66a03c93c26d39eec1.png)
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【推荐1】如图,将
绕点A逆时针旋转
,得到
.若点D在线段
的延长线上,则![](https://staticzujuan.xkw.com/quesimg/Upload/formula/afde09d82ae96f00c135732baee64776.png)
________ .
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/15c0dbe3c080c4c4636c64803e5c1f76.png)
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![](https://staticzujuan.xkw.com/quesimg/Upload/formula/afde09d82ae96f00c135732baee64776.png)
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