s圆的公式
为了让学生有时间、有机会充分地了解圆的文化,理解圆的知识,渭南高新区教育文体局组织各校数学组利用暑假开展了一系列关于“圆的认识”实践性作业活动。学生依据所收集的资料,通过绘画、思维导图、手抄报等形式,多方面展示圆的相关知识。
一、探索圆周率
![](https://p0.ssl.img.360kuai.com/t014244e3438b750a52.jpg)
![](https://p0.ssl.img.360kuai.com/t01ac486d973b938f2c.jpg)
同学们动手把了解到的关于π的知识画成了数学手抄报,用图画和文字记录下自己收获,在交流分享中对π的发展有了更全面的认识,更是对数学历史产生浓厚的兴趣。
![](https://p0.ssl.img.360kuai.com/t01093a9d15285e8636.jpg)
![](https://p0.ssl.img.360kuai.com/t0107f501c207e91e88.jpg)
![](https://p0.ssl.img.360kuai.com/t015498a0a8a3db55d7.jpg)
二、圆元素之巧手设计
![](https://p0.ssl.img.360kuai.com/t018a161d9a2d3fd851.jpg)
![](https://p0.ssl.img.360kuai.com/t019475ac1203ec0afc.jpg)
![](https://p0.ssl.img.360kuai.com/t01ed20edc864773211.jpg)
通过对圆的认识学习,进一步感受圆的特征,体会图形的变换,提高学生动手能力和创造能力,学生们用自己最喜欢的方式表达着“内心的圆”,瞧!孩子们画得多有创意啊!
![](https://p0.ssl.img.360kuai.com/t017e6bd078a63adfd9.jpg)
![](https://p0.ssl.img.360kuai.com/t013501510655f7d5ab.jpg)
![](https://p0.ssl.img.360kuai.com/t01d06b70fe5182e090.jpg)
三、圆知识预习思维导图
孩子们根据自己的知识水平、认知程度、生活经验进行了尝试性学习,把知识条理化和体系化,并制作圆的预习思维导图。在预习的基础上拓展了科学性、趣味性和针对性内容,使学习变得灵活生动。
![](https://p0.ssl.img.360kuai.com/t01f6cd58a98a8f2fb7.jpg)
![](https://p0.ssl.img.360kuai.com/t017aafc24f06f13bbd.jpg)
![](https://p0.ssl.img.360kuai.com/t010a745ae280022726.jpg)
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四、花样圆面积公式推导
![](https://p0.ssl.img.360kuai.com/t014f76a4349f810389.jpg)
我们都知道,圆的面积公式为S圆=πr2,那公式究竟是如何的来的呢?让我们跟随孩子们的视角一起来看看他们的推导过程吧。
![](https://p0.ssl.img.360kuai.com/t01458adfbe7f5ea690.jpg)
![](https://p0.ssl.img.360kuai.com/t017e71d402c664e8c6.jpg)
五、圆说数学文化
![](https://p0.ssl.img.360kuai.com/t01d110278b40fccde6.jpg)
![](https://p0.ssl.img.360kuai.com/t01418546a4f6d743fc.jpg)
在数学上,圆是“正无限多边形”,圆周率是一个无限不循环小数,所以圆同时也代表着无限可能,代表着人类永无止境的幻想和探索!因此,这也引起了学生对圆文化的探究热情。
![](https://p0.ssl.img.360kuai.com/t01821180431efc5243.jpg)
![](https://p0.ssl.img.360kuai.com/t01779fc09d9e521cf2.jpg)
渭南高新区教育文体局表示,这次数学特色实践活动更是一场探寻“美”的旅程,孩子们在欣赏美、发现美、创作美的过程中,调动学习积极性、提高学习兴趣。在动手动脑中,感受美在数学,美在生活,为自己插上想象的翅膀,用智慧扮美生活,为生活增色添彩。
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卞录兴3518六年级数学上册所有圆的公式 -
蓟泼谈14781183021 ______ 圆形:S面积C周长∏d=直径r=半径,(1)周长=直径*∏=2*∏*半径,C=∏d=2∏r,(2)面积=半径*半径*∏圆柱体:v:体积h:高s;底面积r:底面半径c:底面周长,(1)侧面积=底面周长*高,(2)表面积=侧面积+底面积*2,(3)体积=底面积*高,(4)体积=侧面积÷2*半径圆锥体v:体积h:高s;底面积r:底面半径体积=底面积*高÷3总数÷总份数=平均数和差问题的公式:(和+差)÷2=大数,(和-差)÷2=小数和倍问题,和÷(倍数-1)=小数,小数*倍数=大数,(或者和-小数=大数),差倍问题,差÷(倍数-1)=小数,小数*倍数=大数(或小数+差=大数)
卞录兴3518圆的所有公式 -
蓟泼谈14781183021 ______ 1圆的面积公式 S=πr²即 s=3.14*半径的平方 2如果园的半径是r,直径是R,则园的周长L是:L=2πr=πR.也即园周长是园周率乘以直径. 3弧长l=|α|r l=nπr/180 4圆的标准方程 (x-a)^2+(y-b)^2=^r2 注:(a,b)是圆心坐标 5接圆半径 余弦定理 ...
卞录兴3518圆柱和圆的公式 -
蓟泼谈14781183021 ______ 体积和表面积 三角形的面积=底*高÷2. 公式 S= a*h÷2 正方形的面积=边长*边长 公式 S= a2 长方形的面积=长*宽 公式 S= a*b 平行四边形的面积=底*高 公式 S= a*h 梯形的面积=(上底+下底)*高÷2 公式 S=(a+b)h÷2 内角和:三角形的内角和=...
卞录兴3518圆形的面积公式 知道周长怎么算半径 关于圆的数学公式 -
蓟泼谈14781183021 ______ S圆=π*R² C圆=2πR或πD
卞录兴3518知道圆的面积,怎么求半径,公式 -
蓟泼谈14781183021 ______ 圆的半径等于圆的面积除以π的商开根号.具体计算过程如下. 解:令圆的面积为S,圆的半径为r. 若已知圆的面积S,那么根据圆的面积公式S=π*r^2,可得, r^2=S/π,则r=√(S/π) 即抑制圆面积求半径的公式为r=√(S/π). 扩展资料: 1、...
卞录兴3518圆的周长公式是什么 -
蓟泼谈14781183021 ______ 假设圆的半径r,直径d,周长C,有如下公式: 圆的周长 = 半径*2 *圆周率 = 直径* 圆周率 用字母代替就是:C=2πr=πd 拓展资料: 圆周长是指在圆中内接一个正n边形,边长设为an,正边形的周长为n*an,当n不断增大的时候,正边形的周长...
卞录兴3518圆的半径、周长与面积间的所有公式 -
蓟泼谈14781183021 ______ 圆的所有公式 周长:C=2πr (r半径) 面积:S=πr² 半圆周长:C=πr+2r 半圆面积:S=πr²/2 圆的标准方程:在平面直角坐标系中,以点O(a,b)为圆心,以r为半径的圆的标准方程是(x-a)^2+(y-b)^2=r^2. 圆的一般方程:把圆的标准方程展开...
卞录兴3518有谁能把圆的公式列一下吗??能用纯数字列式吗英文字母看不懂.俺笨 -
蓟泼谈14781183021 ______ 圆的定义:①在同一平面内,一条线段绕着它的固定端点旋转一周,另一个端点随之旋转所形成的图形叫做圆.这个固定端点叫做圆心,这条线段叫做半径...
卞录兴3518 圆的面积计算公式用字母表示应该是 S=πr 2 S=πr 2 . -
蓟泼谈14781183021 ______[答案] 分析:用S表示圆的面积,r表示圆的半径,所以圆的面积公式是:S=πr2.圆的面积计算公式用字母表示应该是S=πr2.故答案为:S=πr2.点评:本题考查了用字母表示圆的面积公式,圆的面积公式:S=πr2.
卞录兴3518数学圆的公式
蓟泼谈14781183021 ______ 圆的面积公式是S=πr²,r是圆的半径, 扇形的面积公式是S=nπR²/360 (n是扇形的圆心角),扇形的面积公式或是S=rl/2 (r是圆的半径,l是弧长)