一个圆锥的侧面展开图是半径为4的半圆,则该圆锥的底面半径是________ .
![](https://img.xkw.com/dksih/QBM/2011/12/26/1573317174018048/1573317213020160/STEM/a0976777a9114266a42f0f2398851ab1.png?resizew=220)
12-13九年级上·广西南宁·期中 查看更多[1]
(已下线)2012届广西南宁九中九年级上学期期中考试数学卷Ⅰ
更新时间:2019-01-30 18:14:09
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【知识点】 几何问题(一元一次方程的应用)解读
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【推荐1】如图,
,C是
延长线上一点,
,动点P从点C出发沿
以
的速度移动,动点Q从点O出发沿
以
的速度移动,如果点P、Q同时出发,用
表示移动的时间,当![](https://staticzujuan.xkw.com/quesimg/Upload/formula/825116eb345f5505ebc8c1cdb8a1f131.png)
_______________ s时,
是等腰三角形.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/dc1eb76fe74cba30f7cbcde349ba80da.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/aaf1438142deeac876fc7dc50552e552.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/87e54ce8de98236a2d8246a65c53ef3c.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/6b1bd1adfe4cc6566218f19970c2fd3b.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d989a128e30a701dfff5592476a76bab.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ef4113c492885ba7c47fe42ac792578f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5631e6ec24d3d67bf4592313b6b3f4f8.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/41fb80b591b497d8d7a6d8592160de44.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/825116eb345f5505ebc8c1cdb8a1f131.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0fdc02f00cf00a6dfd88b53a90f1f7a4.png)
![](https://img.xkw.com/dksih/QBM/editorImg/2023/12/3/7f6a8f3d-bfe0-4c46-909b-c79136d40ebe.png?resizew=137)
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【推荐2】如图,在平面内,点O是直线
上一点,
,射线
不动,射线
同时开始绕点O顺时针转动,射线
首次回到起始位置时两线同时停止转动,射线
的转动速度分别为每秒
和每秒
.若转动t秒时,射线
中的一条是另外两条组成角的角平分线,则![](https://staticzujuan.xkw.com/quesimg/Upload/formula/825116eb345f5505ebc8c1cdb8a1f131.png)
______ 秒.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/60ef95894ceebaf236170e8832dcf7e3.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/dc1eb76fe74cba30f7cbcde349ba80da.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/828628c0876b45381c9a0edeb0fec236.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7d071d008cdc313f6ed16a602f8a9669.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ef4113c492885ba7c47fe42ac792578f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7d071d008cdc313f6ed16a602f8a9669.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d36581140ebac5d28438ea63b1b23b65.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0aee6e4e9350a2665df8597ff8045bbd.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/750e8652e3d3976bfc17e2c88ccec42b.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/825116eb345f5505ebc8c1cdb8a1f131.png)
![](https://img.xkw.com/dksih/QBM/editorImg/2024/2/14/dcdf6768-256f-4478-af8b-9d9e40fa0442.png?resizew=160)
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