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

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。

二、圆元素之巧手设计

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！

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。

四、花样圆面积公式推导

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。

五、圆说数学文化

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。

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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支疤戴2245多边形的面积怎样求?公式?如正六边形? -
洪史肺17627765656 ______ 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

支疤戴2245五年级上数学多边形面积公式是什么?字母表示 -
洪史肺17627765656 ______ 三角形面积:S=a*h÷2 梯形面积:S=(a+b)*h÷2 平行四边形面积:S=a*h

支疤戴2245多边形的面积怎么求?
洪史肺17627765656 ______ 三角形的面积=底*高/2 正方形的面积=边长乘边长 长方形的面积=长乘宽 平行四边形面积=底乘高 梯形的面积=(上底+下底)*高/2

支疤戴2245五年级多边形的面积 -
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洪史肺17627765656 ______ 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

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洪史肺17627765656 ______ 多边形的面积只要超过3边(除了规则的四边形【矩形{等边或者等角}】),就必须切割为三角形来计算面积.三角形的面积计算公式为:底x高/2 然后把每个三角形的面积加起来就是多边形面积了

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洪史肺17627765656 ______[答案] S△=30÷2=15m² S=24*2=48cm²

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洪史肺17627765656 ______[答案] 设:正n边形的中心角为N,半径为R,则边长为an=2Rsinn/2,边心距rn=Rcosn/2,s△=1/2an.rn=1/2*2RsinN/2 *RcosN/2=R²sinN/2.cosN2..所以Sn=nR²sinN/2.cosN/2..(n为正多边形的边数,N为中心角N=360/n,),...

支疤戴2245Y5《数学报》——多边形的面积 整理和复习(一)上的“智慧小博士”实验小学五年级同学在进行广播操表演时,围成了一个直角三角形,已知每条边上的... -
洪史肺17627765656 ______[答案] (16x2)x(21x2)

支疤戴2245随着圆内接正多边形边数的增加,正多边形的周长(面积)有怎样的变化趋势 -
洪史肺17627765656 ______[答案] 随着圆内接正多边形边数的增加,正多边形的周长(面积)都逐渐增大,越来越接近圆的周长(面积). 当正多边形的边数趋近于+∞时,其极限值即为圆的周长(面积).