2022年2018青岛版七年级数学下册13.3《圆》—等圆与同心圆教学案 .pdf

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1、名师精编优秀教案课题13.3（2）等圆与同心圆课型新授课授课时间20XX年月日执笔人代朝东审稿人七年级数学组总第 8 课时标准陈述了解等圆与同心圆的定义，会计算圆的周长与面积。学习目标1.理解等圆、同心圆与圆环的概念，能说出等圆和同心圆的区别；2.会用圆的面积与周长公式进行有关简单问题的计算。教 学 活 动 方 案随记【创设情境，激发兴趣】准备好一角、五角、一元的硬币，观察两个同样面值的硬币，它们能够重合吗？若面值不等呢？【明确目标，自学新知】阅读学习目标并能了解本节所需研究的内容。1.能够的圆叫做 等圆。等圆的半径，直径，周长，面积。2.圆心、半径不等的圆叫做 同心圆。等圆与同心圆的区别是什

2、么？圆心位置：半径：3.已知 O1与 O2是同心圆，O1的半径是5cm，O2的半径是7cm，若点 P到圆心的距离分别是8cm、7cm、6cm、5cm、4cm，则点 P与两个圆的位置关系分别是什么？名师精编优秀教案教 学 活 动 方 案随记【交流提升，能力展示】1.两个同心圆之间的部分叫做圆环，如果圆环中大圆的半径为r，小圆的半径为2r，求圆环的面积。2.（1）已知圆的周长是18cm，则圆的半径是。（2）用长度分别为1 米和 2 米的两根绳子围成两个同心圆，这两个圆的半径之差是多少？（3）把地球的赤道近似地看作一个圆，如果环绕地球赤道有一个圆，它的周长比赤道的周长多10 米，这两个同心圆的半径之

3、差是多少？想想看，两圆之间能钻过去一只羊吗？3.在一片草地上A 点栓了一头牛，B 点栓了一只羊，其中栓牛的绳子长 7m,拴羊的绳子长5m，用圆规画出牛和羊都可以吃到草的区域。各小组选出代表分别板书演示，其他小组成员可直接指出错误之处并加以改正。【释疑解惑，技巧点拨】圆环面积公式：S圆环=2R-2rA B 羊牛文档编码:CL4S4I5O8M8 HB9G5M3X5D4 ZB8T9L1E7V8文档编码:CL4S4I5O8M8 HB9G5M3X5D4 ZB8T9L1E7V8文档编码:CL4S4I5O8M8 HB9G5M3X5D4 ZB8T9L1E7V8文档编码:CL4S4I5O8M8 HB9G5M3X

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7、CL4S4I5O8M8 HB9G5M3X5D4 ZB8T9L1E7V8文档编码:CL4S4I5O8M8 HB9G5M3X5D4 ZB8T9L1E7V8文档编码:CL4S4I5O8M8 HB9G5M3X5D4 ZB8T9L1E7V8文档编码:CL4S4I5O8M8 HB9G5M3X5D4 ZB8T9L1E7V8文档编码:CL4S4I5O8M8 HB9G5M3X5D4 ZB8T9L1E7V8文档编码:CL4S4I5O8M8 HB9G5M3X5D4 ZB8T9L1E7V8文档编码:CL4S4I5O8M8 HB9G5M3X5D4 ZB8T9L1E7V8文档编码:CL4S4I5O8M8 HB9G5M3X

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9、CL4S4I5O8M8 HB9G5M3X5D4 ZB8T9L1E7V8文档编码:CL4S4I5O8M8 HB9G5M3X5D4 ZB8T9L1E7V8文档编码:CL4S4I5O8M8 HB9G5M3X5D4 ZB8T9L1E7V8文档编码:CL4S4I5O8M8 HB9G5M3X5D4 ZB8T9L1E7V8文档编码:CL4S4I5O8M8 HB9G5M3X5D4 ZB8T9L1E7V8文档编码:CL4S4I5O8M8 HB9G5M3X5D4 ZB8T9L1E7V8文档编码:CL4S4I5O8M8 HB9G5M3X5D4 ZB8T9L1E7V8名师精编优秀教案教 学 活 动 方 案随记【达标测

10、试，反馈矫正】1.以一个定点为圆心，可以画个圆，他们是；以一条已知线段为半径画圆，可以画个圆，他们是；以一个顶点为圆心，以一条已知线段为半径，可以画个圆。2.你能用图形表示“平面内到点A的距离大于1 厘米而小于2.5厘米的点的集合吗？3.如果 A的周长是 B的周长的 4 倍，那么 A的面积 B面积的几倍？4.如图，ABCD 是正方形，边长为2，以 B为圆心，以BA为半径画弧，则阴影面积为多少？1.到点 O的距离大于1cme而小于 2cm的点的集合是。2.课本 152 页“挑战自我”。【归纳总结，作业布置】1.课本 153 页第 5 题，153 页第 6 题。文档编码:CL4S4I5O8M8 H

11、B9G5M3X5D4 ZB8T9L1E7V8文档编码:CL4S4I5O8M8 HB9G5M3X5D4 ZB8T9L1E7V8文档编码:CL4S4I5O8M8 HB9G5M3X5D4 ZB8T9L1E7V8文档编码:CL4S4I5O8M8 HB9G5M3X5D4 ZB8T9L1E7V8文档编码:CL4S4I5O8M8 HB9G5M3X5D4 ZB8T9L1E7V8文档编码:CL4S4I5O8M8 HB9G5M3X5D4 ZB8T9L1E7V8文档编码:CL4S4I5O8M8 HB9G5M3X5D4 ZB8T9L1E7V8文档编码:CL4S4I5O8M8 HB9G5M3X5D4 ZB8T9L1E7

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13、B9G5M3X5D4 ZB8T9L1E7V8文档编码:CL4S4I5O8M8 HB9G5M3X5D4 ZB8T9L1E7V8文档编码:CL4S4I5O8M8 HB9G5M3X5D4 ZB8T9L1E7V8文档编码:CL4S4I5O8M8 HB9G5M3X5D4 ZB8T9L1E7V8文档编码:CL4S4I5O8M8 HB9G5M3X5D4 ZB8T9L1E7V8文档编码:CL4S4I5O8M8 HB9G5M3X5D4 ZB8T9L1E7V8文档编码:CL4S4I5O8M8 HB9G5M3X5D4 ZB8T9L1E7V8文档编码:CL4S4I5O8M8 HB9G5M3X5D4 ZB8T9L1E7

14、V8文档编码:CL4S4I5O8M8 HB9G5M3X5D4 ZB8T9L1E7V8文档编码:CL4S4I5O8M8 HB9G5M3X5D4 ZB8T9L1E7V8文档编码:CL4S4I5O8M8 HB9G5M3X5D4 ZB8T9L1E7V8文档编码:CL4S4I5O8M8 HB9G5M3X5D4 ZB8T9L1E7V8文档编码:CL4S4I5O8M8 HB9G5M3X5D4 ZB8T9L1E7V8文档编码:CL4S4I5O8M8 HB9G5M3X5D4 ZB8T9L1E7V8文档编码:CL4S4I5O8M8 HB9G5M3X5D4 ZB8T9L1E7V8文档编码:CL4S4I5O8M8 H

15、B9G5M3X5D4 ZB8T9L1E7V8文档编码:CL4S4I5O8M8 HB9G5M3X5D4 ZB8T9L1E7V8文档编码:CL4S4I5O8M8 HB9G5M3X5D4 ZB8T9L1E7V8文档编码:CL4S4I5O8M8 HB9G5M3X5D4 ZB8T9L1E7V8文档编码:CL4S4I5O8M8 HB9G5M3X5D4 ZB8T9L1E7V8文档编码:CL4S4I5O8M8 HB9G5M3X5D4 ZB8T9L1E7V8文档编码:CL4S4I5O8M8 HB9G5M3X5D4 ZB8T9L1E7V8文档编码:CL4S4I5O8M8 HB9G5M3X5D4 ZB8T9L1E7

16、V8文档编码:CL4S4I5O8M8 HB9G5M3X5D4 ZB8T9L1E7V8文档编码:CL4S4I5O8M8 HB9G5M3X5D4 ZB8T9L1E7V8文档编码:CL4S4I5O8M8 HB9G5M3X5D4 ZB8T9L1E7V8文档编码:CL4S4I5O8M8 HB9G5M3X5D4 ZB8T9L1E7V8文档编码:CL4S4I5O8M8 HB9G5M3X5D4 ZB8T9L1E7V8文档编码:CL4S4I5O8M8 HB9G5M3X5D4 ZB8T9L1E7V8文档编码:CL4S4I5O8M8 HB9G5M3X5D4 ZB8T9L1E7V8文档编码:CL4S4I5O8M8 H

17、B9G5M3X5D4 ZB8T9L1E7V8文档编码:CL4S4I5O8M8 HB9G5M3X5D4 ZB8T9L1E7V8文档编码:CL4S4I5O8M8 HB9G5M3X5D4 ZB8T9L1E7V8名师精编优秀教案文档编码:CL4S4I5O8M8 HB9G5M3X5D4 ZB8T9L1E7V8文档编码:CL4S4I5O8M8 HB9G5M3X5D4 ZB8T9L1E7V8文档编码:CL4S4I5O8M8 HB9G5M3X5D4 ZB8T9L1E7V8文档编码:CL4S4I5O8M8 HB9G5M3X5D4 ZB8T9L1E7V8文档编码:CL4S4I5O8M8 HB9G5M3X5D4 Z

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