画多边形的面积手抄报
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)
![](https://p0.ssl.img.360kuai.com/t0164f5c479dd099333.jpg)
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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政要鸦1342多边形的面积怎样求?公式?如正六边形? -
诸饲茜13312332184 ______ 正多边形面积公式(设边长为a) 面积=四分之根号三*a的平方*边数 例如正六边形面积=二分之三根号三*a的平方
政要鸦1342五年级多边形的面积
诸饲茜13312332184 ______ (1)三角形:4.4*3.8/2=8.36 (2)平行四边形:4.2*4.4=18.48 (3)梯形:上底:5+4.2-3.8-4.2或直接用:5-3.8=1.2 (1.2+5)*4.4/2=13.64
政要鸦1342五年级多边形的面积 -
诸饲茜13312332184 ______ 设长方形的宽是x厘米,则根据题意知道长方形的长是3x厘米(这样把长等分成3份,长度都是x厘米,符合题意),则长方形的周长公式为2*(x+3x)=72,得x=9.长方形的长为3x=27厘米,宽为x=9厘米,正方形的边长为9厘米,正方形的周长为4*9=36厘米,面积为9*9=81平方厘米
政要鸦1342边长是1厘米的小正方形,画一个多边形,使多边形面积是2cm2 -
诸饲茜13312332184 ______ 1、2*2*1/2=2 2、√2*√2﹦2
政要鸦1342请你在网格中画一个多边形,并利用皮克公式计算它的面积. -
诸饲茜13312332184 ______ 皮克公式是皮克(Pick)在1899年给出的,被称为“皮克定理”,这是一个实用而有趣的定理.给定顶点坐标均是整点(或正方形格点)的简单多边形,皮克定理说明了其面积S和内部格点数目a、边上格点数目b的关系:S=a+ b/2 - 1.(其中a表示多边形内部的点数,b表示多边形边界上的点数,S表示多边形的面积) http://baike.baidu.com/view/411843.htm
政要鸦1342正多边形的面积如何求的? -
诸饲茜13312332184 ______ 面积公式为1/2*n*sin(2π/n)*R^2 内角和公式为(n-2)*180º
政要鸦1342益智园,小学五年级多边形的面积 -
诸饲茜13312332184 ______ C ,设正方形边长为1.三角形的底都为1/2,两个三角形的面积和1/2*0.5*高+1/2*0.5*高=1/2*0.5*(两个高之和=正方形边长)=1/4,所以阴影面积占正方形1/4
政要鸦1342一道五年级上学期第5章《多边形的面积》题
诸饲茜13312332184 ______ 画个图 增加的面积是两个长方形和一个小正方形,这个小正方形的边长是5厘米 两个长方形的宽是也是5厘米,长是原正方形的长 小正方形的面积是5*5=25平方厘米 则一个长方形的面积是(95-25)÷2=35平方厘米 则长方形的长是35÷5=7厘米也就是原正方形的边长 原正方形的面积是7*7=49平方厘米
政要鸦1342多边形的面积(一)1.用剪拼的方法可以把一个平行四边形转化成一个长方形,这个长方形的长与平行四边形的底( ),长方形的宽与平行四边形的高( )... -
诸饲茜13312332184 ______[答案] 1. 相等;相等;相等 2. 40 3. 162 4. 7.5 5. 相等 1.错 2.错 3.错
政要鸦1342相邻边长为1的图形的面积为10的多边形的图形怎么画? -
诸饲茜13312332184 ______ 长5宽2的矩形(长方形)