1 . 综合与实践
问题情境:如图1,将一个底面半径为
的圆锥侧面展开,可得到一个半径为
,圆心角为
的扇形.工人在制作圆锥形物品时,通常要先确定扇形圆心角度数,再度量裁剪材料.
![](https://img.xkw.com/dksih/QBM/editorImg/2023/2/21/da0e12b2-b191-4468-9a1f-cc6846a3908a.png?resizew=349)
(1)探索尝试:图1中,圆锥底面周长与其侧面展开图的弧长________;(填“相等”或“不相等”)若
,
,则
________.
(2)解决问题:为操作简便,工人希望能简洁求
的值,请用含
,
的式子表示
;
(3)拓展延伸:图2是一种纸质圆锥形生日帽,
,
,
是
中点,现要从点
到点
再到点
之间拉一装饰彩带,求彩带长度的最小值.
问题情境:如图1,将一个底面半径为
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/11bc05f41215f9894e11d1df0465751a.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0f85fca60a11e1af2bf50138d0e3fe62.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/4a3d921fa160bfa9f74fe51dedfe3413.png)
![](https://img.xkw.com/dksih/QBM/editorImg/2023/2/21/da0e12b2-b191-4468-9a1f-cc6846a3908a.png?resizew=349)
(1)探索尝试:图1中,圆锥底面周长与其侧面展开图的弧长________;(填“相等”或“不相等”)若
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2650f336973e5d3aec1158a4d813bd36.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5a4e5ce4a536dd5db2863dba71faa8b5.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0f3cb8d72bb2e281b943b3b430138ef7.png)
(2)解决问题:为操作简便,工人希望能简洁求
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b6a24198bd04c29321ae5dc5a28fe421.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/11bc05f41215f9894e11d1df0465751a.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0f85fca60a11e1af2bf50138d0e3fe62.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b6a24198bd04c29321ae5dc5a28fe421.png)
(3)拓展延伸:图2是一种纸质圆锥形生日帽,
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/6747441b260ca043446b5d472fece440.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2804e2ee560d5804829d91fe6a3ed4b9.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c5db41a1f31d6baee7c69990811edb9f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d2be49c37e30a3ced0364c3e74d8c687.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5963abe8f421bd99a2aaa94831a951e9.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c5db41a1f31d6baee7c69990811edb9f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5963abe8f421bd99a2aaa94831a951e9.png)
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2023-02-20更新
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