2022年北京课改版数学九上21.1《圆的有关概念》word教案2 .pdf

名师精编优秀教案课题21.1圆的有关概念-2 教学目标1、学生理解弧、弦、圆心角、同心圆、等圆、等弧的概念；2、经历弧长公式的形成过程，能准确运用公式计算；3、培养学生分析理解数学语言的能力与计算能力。教学重点与圆有关的概念，弧长公式的形成与应用教学难点类比概念间的联系教学方法引导探究式教学手段教学过程师生活动设计说明名师精编优秀教案一、引入新课二、新课探究复习引入：1、圆的定义及两要素：2、圆 将 平 面 上的 点 分 成 了 几 部分？3、点与圆的位置关系有几种？如何判断？学生任意作出一圆，按照自己的理解，你能分别作出它的同心圆和等圆吗？如何描述相应的概念？教师巡视，倾听，并适时引导学生小结概念：1、圆心相同，半径不同的两个圆称为同心圆；能够完全 重合的两圆称为等圆。练习：P125-结合靶子图片体会同圆与等圆的概念。巩固基础知识，为 后 面 的 学 习奠定基础；教学过程师生活动设计说明文档编码:CJ7L9F7X5I6 HN7F10L2V3S10 ZA9Y7L5Q6S6文档编码:CJ7L9F7X5I6 HN7F10L2V3S10 ZA9Y7L5Q6S6文档编码:CJ7L9F7X5I6 HN7F10L2V3S10 ZA9Y7L5Q6S6文档编码:CJ7L9F7X5I6 HN7F10L2V3S10 ZA9Y7L5Q6S6文档编码:CJ7L9F7X5I6 HN7F10L2V3S10 ZA9Y7L5Q6S6文档编码:CJ7L9F7X5I6 HN7F10L2V3S10 ZA9Y7L5Q6S6文档编码:CJ7L9F7X5I6 HN7F10L2V3S10 ZA9Y7L5Q6S6文档编码:CJ7L9F7X5I6 HN7F10L2V3S10 ZA9Y7L5Q6S6文档编码:CJ7L9F7X5I6 HN7F10L2V3S10 ZA9Y7L5Q6S6文档编码:CJ7L9F7X5I6 HN7F10L2V3S10 ZA9Y7L5Q6S6文档编码:CJ7L9F7X5I6 HN7F10L2V3S10 ZA9Y7L5Q6S6文档编码:CJ7L9F7X5I6 HN7F10L2V3S10 ZA9Y7L5Q6S6文档编码:CJ7L9F7X5I6 HN7F10L2V3S10 ZA9Y7L5Q6S6文档编码:CJ7L9F7X5I6 HN7F10L2V3S10 ZA9Y7L5Q6S6文档编码:CJ7L9F7X5I6 HN7F10L2V3S10 ZA9Y7L5Q6S6文档编码:CJ7L9F7X5I6 HN7F10L2V3S10 ZA9Y7L5Q6S6文档编码:CJ7L9F7X5I6 HN7F10L2V3S10 ZA9Y7L5Q6S6文档编码:CJ7L9F7X5I6 HN7F10L2V3S10 ZA9Y7L5Q6S6文档编码:CJ7L9F7X5I6 HN7F10L2V3S10 ZA9Y7L5Q6S6文档编码:CJ7L9F7X5I6 HN7F10L2V3S10 ZA9Y7L5Q6S6文档编码:CJ7L9F7X5I6 HN7F10L2V3S10 ZA9Y7L5Q6S6文档编码:CJ7L9F7X5I6 HN7F10L2V3S10 ZA9Y7L5Q6S6文档编码:CJ7L9F7X5I6 HN7F10L2V3S10 ZA9Y7L5Q6S6文档编码:CJ7L9F7X5I6 HN7F10L2V3S10 ZA9Y7L5Q6S6文档编码:CJ7L9F7X5I6 HN7F10L2V3S10 ZA9Y7L5Q6S6文档编码:CJ7L9F7X5I6 HN7F10L2V3S10 ZA9Y7L5Q6S6文档编码:CJ7L9F7X5I6 HN7F10L2V3S10 ZA9Y7L5Q6S6文档编码:CJ7L9F7X5I6 HN7F10L2V3S10 ZA9Y7L5Q6S6文档编码:CJ7L9F7X5I6 HN7F10L2V3S10 ZA9Y7L5Q6S6文档编码:CJ7L9F7X5I6 HN7F10L2V3S10 ZA9Y7L5Q6S6文档编码:CJ7L9F7X5I6 HN7F10L2V3S10 ZA9Y7L5Q6S6文档编码:CJ7L9F7X5I6 HN7F10L2V3S10 ZA9Y7L5Q6S6文档编码:CJ7L9F7X5I6 HN7F10L2V3S10 ZA9Y7L5Q6S6文档编码:CJ7L9F7X5I6 HN7F10L2V3S10 ZA9Y7L5Q6S6文档编码:CJ7L9F7X5I6 HN7F10L2V3S10 ZA9Y7L5Q6S6文档编码:CJ7L9F7X5I6 HN7F10L2V3S10 ZA9Y7L5Q6S6文档编码:CJ7L9F7X5I6 HN7F10L2V3S10 ZA9Y7L5Q6S6文档编码:CJ7L9F7X5I6 HN7F10L2V3S10 ZA9Y7L5Q6S6文档编码:CJ7L9F7X5I6 HN7F10L2V3S10 ZA9Y7L5Q6S6文档编码:CJ7L9F7X5I6 HN7F10L2V3S10 ZA9Y7L5Q6S6文档编码:CJ7L9F7X5I6 HN7F10L2V3S10 ZA9Y7L5Q6S6文档编码:CJ7L9F7X5I6 HN7F10L2V3S10 ZA9Y7L5Q6S6文档编码:CJ7L9F7X5I6 HN7F10L2V3S10 ZA9Y7L5Q6S6文档编码:CJ7L9F7X5I6 HN7F10L2V3S10 ZA9Y7L5Q6S6文档编码:CJ7L9F7X5I6 HN7F10L2V3S10 ZA9Y7L5Q6S6文档编码:CJ7L9F7X5I6 HN7F10L2V3S10 ZA9Y7L5Q6S6文档编码:CJ7L9F7X5I6 HN7F10L2V3S10 ZA9Y7L5Q6S6文档编码:CJ7L9F7X5I6 HN7F10L2V3S10 ZA9Y7L5Q6S6名师精编优秀教案2、弧：（教师结合图形引导学生体会概念）定义：圆上任意两点之间的部分叫做圆弧。强调：（1）半圆是一类特殊的弧，而不是所有的弧都是半圆；（2）以半圆为界限，弧分为两类：优弧（大于半圆的弧），劣弧（小于半圆的弧）；（3）同圆或等圆 中能够互相重合的弧叫做等弧。（不单只关注弧长还包括弯曲程度）3、弦：（教师结合图形引导学生体会概念）定义：联结圆上任意两点的线段叫做弦。强调：（1）经过圆心的弦称为直径；（2）直径是一类特殊的弦，而不是所有的弦都是直径；4、圆心角：（教师结合图形引导学生体会概念）定义：顶点在圆心，且角的两边与圆相交得到的角称为圆心角。练习：P126 5、上述各量间的联系：教师板书表示方法；优弧用 3 个字母表示，而劣弧只需2 个字母；体会概念间的联系：文档编码:CJ7L9F7X5I6 HN7F10L2V3S10 ZA9Y7L5Q6S6文档编码:CJ7L9F7X5I6 HN7F10L2V3S10 ZA9Y7L5Q6S6文档编码:CJ7L9F7X5I6 HN7F10L2V3S10 ZA9Y7L5Q6S6文档编码:CJ7L9F7X5I6 HN7F10L2V3S10 ZA9Y7L5Q6S6文档编码:CJ7L9F7X5I6 HN7F10L2V3S10 ZA9Y7L5Q6S6文档编码:CJ7L9F7X5I6 HN7F10L2V3S10 ZA9Y7L5Q6S6文档编码:CJ7L9F7X5I6 HN7F10L2V3S10 ZA9Y7L5Q6S6文档编码:CJ7L9F7X5I6 HN7F10L2V3S10 ZA9Y7L5Q6S6文档编码:CJ7L9F7X5I6 HN7F10L2V3S10 ZA9Y7L5Q6S6文档编码:CJ7L9F7X5I6 HN7F10L2V3S10 ZA9Y7L5Q6S6文档编码:CJ7L9F7X5I6 HN7F10L2V3S10 ZA9Y7L5Q6S6文档编码:CJ7L9F7X5I6 HN7F10L2V3S10 ZA9Y7L5Q6S6文档编码:CJ7L9F7X5I6 HN7F10L2V3S10 ZA9Y7L5Q6S6文档编码:CJ7L9F7X5I6 HN7F10L2V3S10 ZA9Y7L5Q6S6文档编码:CJ7L9F7X5I6 HN7F10L2V3S10 ZA9Y7L5Q6S6文档编码:CJ7L9F7X5I6 HN7F10L2V3S10 ZA9Y7L5Q6S6文档编码:CJ7L9F7X5I6 HN7F10L2V3S10 ZA9Y7L5Q6S6文档编码:CJ7L9F7X5I6 HN7F10L2V3S10 ZA9Y7L5Q6S6文档编码:CJ7L9F7X5I6 HN7F10L2V3S10 ZA9Y7L5Q6S6文档编码:CJ7L9F7X5I6 HN7F10L2V3S10 ZA9Y7L5Q6S6文档编码:CJ7L9F7X5I6 HN7F10L2V3S10 ZA9Y7L5Q6S6文档编码:CJ7L9F7X5I6 HN7F10L2V3S10 ZA9Y7L5Q6S6文档编码:CJ7L9F7X5I6 HN7F10L2V3S10 ZA9Y7L5Q6S6文档编码:CJ7L9F7X5I6 HN7F10L2V3S10 ZA9Y7L5Q6S6文档编码:CJ7L9F7X5I6 HN7F10L2V3S10 ZA9Y7L5Q6S6文档编码:CJ7L9F7X5I6 HN7F10L2V3S10 ZA9Y7L5Q6S6文档编码:CJ7L9F7X5I6 HN7F10L2V3S10 ZA9Y7L5Q6S6文档编码:CJ7L9F7X5I6 HN7F10L2V3S10 ZA9Y7L5Q6S6文档编码:CJ7L9F7X5I6 HN7F10L2V3S10 ZA9Y7L5Q6S6文档编码:CJ7L9F7X5I6 HN7F10L2V3S10 ZA9Y7L5Q6S6文档编码:CJ7L9F7X5I6 HN7F10L2V3S10 ZA9Y7L5Q6S6文档编码:CJ7L9F7X5I6 HN7F10L2V3S10 ZA9Y7L5Q6S6文档编码:CJ7L9F7X5I6 HN7F10L2V3S10 ZA9Y7L5Q6S6文档编码:CJ7L9F7X5I6 HN7F10L2V3S10 ZA9Y7L5Q6S6文档编码:CJ7L9F7X5I6 HN7F10L2V3S10 ZA9Y7L5Q6S6文档编码:CJ7L9F7X5I6 HN7F10L2V3S10 ZA9Y7L5Q6S6文档编码:CJ7L9F7X5I6 HN7F10L2V3S10 ZA9Y7L5Q6S6文档编码:CJ7L9F7X5I6 HN7F10L2V3S10 ZA9Y7L5Q6S6文档编码:CJ7L9F7X5I6 HN7F10L2V3S10 ZA9Y7L5Q6S6文档编码:CJ7L9F7X5I6 HN7F10L2V3S10 ZA9Y7L5Q6S6文档编码:CJ7L9F7X5I6 HN7F10L2V3S10 ZA9Y7L5Q6S6文档编码:CJ7L9F7X5I6 HN7F10L2V3S10 ZA9Y7L5Q6S6文档编码:CJ7L9F7X5I6 HN7F10L2V3S10 ZA9Y7L5Q6S6文档编码:CJ7L9F7X5I6 HN7F10L2V3S10 ZA9Y7L5Q6S6文档编码:CJ7L9F7X5I6 HN7F10L2V3S10 ZA9Y7L5Q6S6文档编码:CJ7L9F7X5I6 HN7F10L2V3S10 ZA9Y7L5Q6S6文档编码:CJ7L9F7X5I6 HN7F10L2V3S10 ZA9Y7L5Q6S6文档编码:CJ7L9F7X5I6 HN7F10L2V3S10 ZA9Y7L5Q6S6名师精编优秀教案教学过程师生活动若将整个圆 360 等分，你发现了哪些被等分的量？圆被等分成 360 个等弧（我们称每一份弧为 10的弧），圆心角被等分成了360 个等角（每个角的度数为10）你发现弧的度数与圆心角度数的关系了吗？弧的度数 等于它所对的 圆心角的度数，记做弧 AB 的度数为 n，或弧 AB 是 n度的弧。学生思考这个关系仅适用于劣弧吗？优弧呢？教师点评，适合于所有的弧。练习：P126 1、你发现了弧长与什么量有关了吗？（增）2、能结合上述的分割过程，猜想并验证弧长公式吗？师生共同形成：弧长公式：体会公式的作用，在已知三个变量中的两个时，我们可以顺利求出另外的一个。练习：P126-127 体会知识的形成过程；加强对数学概念内涵与外延的扩充；体会公式的作用；文档编码:CJ7L9F7X5I6 HN7F10L2V3S10 ZA9Y7L5Q6S6文档编码:CJ7L9F7X5I6 HN7F10L2V3S10 ZA9Y7L5Q6S6文档编码:CJ7L9F7X5I6 HN7F10L2V3S10 ZA9Y7L5Q6S6文档编码:CJ7L9F7X5I6 HN7F10L2V3S10 ZA9Y7L5Q6S6文档编码:CJ7L9F7X5I6 HN7F10L2V3S10 ZA9Y7L5Q6S6文档编码:CJ7L9F7X5I6 HN7F10L2V3S10 ZA9Y7L5Q6S6文档编码:CJ7L9F7X5I6 HN7F10L2V3S10 ZA9Y7L5Q6S6文档编码:CJ7L9F7X5I6 HN7F10L2V3S10 ZA9Y7L5Q6S6文档编码:CJ7L9F7X5I6 HN7F10L2V3S10 ZA9Y7L5Q6S6文档编码:CJ7L9F7X5I6 HN7F10L2V3S10 ZA9Y7L5Q6S6文档编码:CJ7L9F7X5I6 HN7F10L2V3S10 ZA9Y7L5Q6S6文档编码:CJ7L9F7X5I6 HN7F10L2V3S10 ZA9Y7L5Q6S6文档编码:CJ7L9F7X5I6 HN7F10L2V3S10 ZA9Y7L5Q6S6文档编码:CJ7L9F7X5I6 HN7F10L2V3S10 ZA9Y7L5Q6S6文档编码:CJ7L9F7X5I6 HN7F10L2V3S10 ZA9Y7L5Q6S6文档编码:CJ7L9F7X5I6 HN7F10L2V3S10 ZA9Y7L5Q6S6文档编码:CJ7L9F7X5I6 HN7F10L2V3S10 ZA9Y7L5Q6S6文档编码:CJ7L9F7X5I6 HN7F10L2V3S10 ZA9Y7L5Q6S6文档编码:CJ7L9F7X5I6 HN7F10L2V3S10 ZA9Y7L5Q6S6文档编码:CJ7L9F7X5I6 HN7F10L2V3S10 ZA9Y7L5Q6S6文档编码:CJ7L9F7X5I6 HN7F10L2V3S10 ZA9Y7L5Q6S6文档编码:CJ7L9F7X5I6 HN7F10L2V3S10 ZA9Y7L5Q6S6文档编码:CJ7L9F7X5I6 HN7F10L2V3S10 ZA9Y7L5Q6S6文档编码:CJ7L9F7X5I6 HN7F10L2V3S10 ZA9Y7L5Q6S6文档编码:CJ7L9F7X5I6 HN7F10L2V3S10 ZA9Y7L5Q6S6文档编码:CJ7L9F7X5I6 HN7F10L2V3S10 ZA9Y7L5Q6S6文档编码:CJ7L9F7X5I6 HN7F10L2V3S10 ZA9Y7L5Q6S6文档编码:CJ7L9F7X5I6 HN7F10L2V3S10 ZA9Y7L5Q6S6文档编码:CJ7L9F7X5I6 HN7F10L2V3S10 ZA9Y7L5Q6S6文档编码:CJ7L9F7X5I6 HN7F10L2V3S10 ZA9Y7L5Q6S6文档编码:CJ7L9F7X5I6 HN7F10L2V3S10 ZA9Y7L5Q6S6文档编码:CJ7L9F7X5I6 HN7F10L2V3S10 ZA9Y7L5Q6S6文档编码:CJ7L9F7X5I6 HN7F10L2V3S10 ZA9Y7L5Q6S6文档编码:CJ7L9F7X5I6 HN7F10L2V3S10 ZA9Y7L5Q6S6文档编码:CJ7L9F7X5I6 HN7F10L2V3S10 ZA9Y7L5Q6S6文档编码:CJ7L9F7X5I6 HN7F10L2V3S10 ZA9Y7L5Q6S6文档编码:CJ7L9F7X5I6 HN7F10L2V3S10 ZA9Y7L5Q6S6文档编码:CJ7L9F7X5I6 HN7F10L2V3S10 ZA9Y7L5Q6S6文档编码:CJ7L9F7X5I6 HN7F10L2V3S10 ZA9Y7L5Q6S6文档编码:CJ7L9F7X5I6 HN7F10L2V3S10 ZA9Y7L5Q6S6文档编码:CJ7L9F7X5I6 HN7F10L2V3S10 ZA9Y7L5Q6S6文档编码:CJ7L9F7X5I6 HN7F10L2V3S10 ZA9Y7L5Q6S6文档编码:CJ7L9F7X5I6 HN7F10L2V3S10 ZA9Y7L5Q6S6文档编码:CJ7L9F7X5I6 HN7F10L2V3S10 ZA9Y7L5Q6S6文档编码:CJ7L9F7X5I6 HN7F10L2V3S10 ZA9Y7L5Q6S6文档编码:CJ7L9F7X5I6 HN7F10L2V3S10 ZA9Y7L5Q6S6文档编码:CJ7L9F7X5I6 HN7F10L2V3S10 ZA9Y7L5Q6S6文档编码:CJ7L9F7X5I6 HN7F10L2V3S10 ZA9Y7L5Q6S6名师精编优秀教案课堂小结1、圆的相关概念：2、弦与直径、弧与半圆分别是什么关系？（特殊与一般的关系）3、弧长公式的作用：课后作业白皮板书设计课题：概念：图形：课后反思文档编码:CJ7L9F7X5I6 HN7F10L2V3S10 ZA9Y7L5Q6S6文档编码:CJ7L9F7X5I6 HN7F10L2V3S10 ZA9Y7L5Q6S6文档编码:CJ7L9F7X5I6 HN7F10L2V3S10 ZA9Y7L5Q6S6文档编码:CJ7L9F7X5I6 HN7F10L2V3S10 ZA9Y7L5Q6S6文档编码:CJ7L9F7X5I6 HN7F10L2V3S10 ZA9Y7L5Q6S6文档编码:CJ7L9F7X5I6 HN7F10L2V3S10 ZA9Y7L5Q6S6文档编码:CJ7L9F7X5I6 HN7F10L2V3S10 ZA9Y7L5Q6S6文档编码:CJ7L9F7X5I6 HN7F10L2V3S10 ZA9Y7L5Q6S6文档编码:CJ7L9F7X5I6 HN7F10L2V3S10 ZA9Y7L5Q6S6文档编码:CJ7L9F7X5I6 HN7F10L2V3S10 ZA9Y7L5Q6S6文档编码:CJ7L9F7X5I6 HN7F10L2V3S10 ZA9Y7L5Q6S6文档编码:CJ7L9F7X5I6 HN7F10L2V3S10 ZA9Y7L5Q6S6文档编码:CJ7L9F7X5I6 HN7F10L2V3S10 ZA9Y7L5Q6S6文档编码:CJ7L9F7X5I6 HN7F10L2V3S10 ZA9Y7L5Q6S6文档编码:CJ7L9F7X5I6 HN7F10L2V3S10 ZA9Y7L5Q6S6文档编码:CJ7L9F7X5I6 HN7F10L2V3S10 ZA9Y7L5Q6S6文档编码:CJ7L9F7X5I6 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