2022年圆的知识点总结2 .pdf
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1、图 4rRd图 5rRd圆得总结集合:圆:圆可以瞧作就是到定点得距离等于定长得点得集合;圆得外部:可以瞧作就是到定点得距离大于定长得点得集合;圆得内部:可以瞧作就是到定点得距离小于定长得点得集合轨迹:1、到定点得距离等于定长得点得轨迹就是:以定点为圆心,定长为半径得圆;2、到线段两端点距离相等得点得轨迹就是:线段得中垂线;3、到角两边距离相等得点得轨迹就是:角得平分线;4、到直线得距离相等得点得轨迹就是:平行于这条直线且到这条直线得距离等于定长得两条直线;5、到两条平行线距离相等得点得轨迹就是:平行于这两条平行线且到两条直线距离都相等得一条直线点与圆得位置关系:点在圆内dr 点 A 在圆外直线
2、与圆得位置关系:直线与圆相离dr 无交点直线与圆相切d=r 有一个交点直线与圆相交dR+r 外切(图 2)有一个交点d=R+r 相交(图 3)有两个交点R-rdR+r 内切(图 4)有一个交点d=R-r 内含(图 5)无交点dr 文档编码:CE7P2Z2H6P8 HN10Z7S9M10J4 ZT1B10Y7P7X1文档编码:CE7P2Z2H6P8 HN10Z7S9M10J4 ZT1B10Y7P7X1文档编码:CE7P2Z2H6P8 HN10Z7S9M10J4 ZT1B10Y7P7X1文档编码:CE7P2Z2H6P8 HN10Z7S9M10J4 ZT1B10Y7P7X1文档编码:CE7P2Z2H
3、6P8 HN10Z7S9M10J4 ZT1B10Y7P7X1文档编码:CE7P2Z2H6P8 HN10Z7S9M10J4 ZT1B10Y7P7X1文档编码:CE7P2Z2H6P8 HN10Z7S9M10J4 ZT1B10Y7P7X1文档编码:CE7P2Z2H6P8 HN10Z7S9M10J4 ZT1B10Y7P7X1文档编码:CE7P2Z2H6P8 HN10Z7S9M10J4 ZT1B10Y7P7X1文档编码:CE7P2Z2H6P8 HN10Z7S9M10J4 ZT1B10Y7P7X1文档编码:CE7P2Z2H6P8 HN10Z7S9M10J4 ZT1B10Y7P7X1文档编码:CE7P2Z2
4、H6P8 HN10Z7S9M10J4 ZT1B10Y7P7X1文档编码:CE7P2Z2H6P8 HN10Z7S9M10J4 ZT1B10Y7P7X1文档编码:CE7P2Z2H6P8 HN10Z7S9M10J4 ZT1B10Y7P7X1文档编码:CE7P2Z2H6P8 HN10Z7S9M10J4 ZT1B10Y7P7X1文档编码:CE7P2Z2H6P8 HN10Z7S9M10J4 ZT1B10Y7P7X1文档编码:CE7P2Z2H6P8 HN10Z7S9M10J4 ZT1B10Y7P7X1文档编码:CE7P2Z2H6P8 HN10Z7S9M10J4 ZT1B10Y7P7X1文档编码:CE7P2Z
5、2H6P8 HN10Z7S9M10J4 ZT1B10Y7P7X1文档编码:CE7P2Z2H6P8 HN10Z7S9M10J4 ZT1B10Y7P7X1文档编码:CE7P2Z2H6P8 HN10Z7S9M10J4 ZT1B10Y7P7X1文档编码:CE7P2Z2H6P8 HN10Z7S9M10J4 ZT1B10Y7P7X1文档编码:CE7P2Z2H6P8 HN10Z7S9M10J4 ZT1B10Y7P7X1文档编码:CE7P2Z2H6P8 HN10Z7S9M10J4 ZT1B10Y7P7X1文档编码:CE7P2Z2H6P8 HN10Z7S9M10J4 ZT1B10Y7P7X1文档编码:CE7P2
6、Z2H6P8 HN10Z7S9M10J4 ZT1B10Y7P7X1文档编码:CE7P2Z2H6P8 HN10Z7S9M10J4 ZT1B10Y7P7X1文档编码:CE7P2Z2H6P8 HN10Z7S9M10J4 ZT1B10Y7P7X1文档编码:CE7P2Z2H6P8 HN10Z7S9M10J4 ZT1B10Y7P7X1文档编码:CE7P2Z2H6P8 HN10Z7S9M10J4 ZT1B10Y7P7X1文档编码:CE7P2Z2H6P8 HN10Z7S9M10J4 ZT1B10Y7P7X1文档编码:CE7P2Z2H6P8 HN10Z7S9M10J4 ZT1B10Y7P7X1文档编码:CE7P
7、2Z2H6P8 HN10Z7S9M10J4 ZT1B10Y7P7X1文档编码:CE7P2Z2H6P8 HN10Z7S9M10J4 ZT1B10Y7P7X1文档编码:CE7P2Z2H6P8 HN10Z7S9M10J4 ZT1B10Y7P7X1文档编码:CE7P2Z2H6P8 HN10Z7S9M10J4 ZT1B10Y7P7X1文档编码:CE7P2Z2H6P8 HN10Z7S9M10J4 ZT1B10Y7P7X1文档编码:CE7P2Z2H6P8 HN10Z7S9M10J4 ZT1B10Y7P7X1文档编码:CE7P2Z2H6P8 HN10Z7S9M10J4 ZT1B10Y7P7X1文档编码:CE7
8、P2Z2H6P8 HN10Z7S9M10J4 ZT1B10Y7P7X1文档编码:CE7P2Z2H6P8 HN10Z7S9M10J4 ZT1B10Y7P7X1文档编码:CE7P2Z2H6P8 HN10Z7S9M10J4 ZT1B10Y7P7X1文档编码:CE7P2Z2H6P8 HN10Z7S9M10J4 ZT1B10Y7P7X1文档编码:CE7P2Z2H6P8 HN10Z7S9M10J4 ZT1B10Y7P7X1文档编码:CE7P2Z2H6P8 HN10Z7S9M10J4 ZT1B10Y7P7X1文档编码:CE7P2Z2H6P8 HN10Z7S9M10J4 ZT1B10Y7P7X1文档编码:CE
9、7P2Z2H6P8 HN10Z7S9M10J4 ZT1B10Y7P7X1文档编码:CE7P2Z2H6P8 HN10Z7S9M10J4 ZT1B10Y7P7X1点在圆上d=r 点在圆内dr 相切d=r 相交dR+r 外切d=R+r 相交R-rdR+r 内切d=R-r 内含dR-r 五、正多边形与圆1、有关概念正多边形得中心、半径、中心角及其度数、边心距2、方法思路:构造等腰(等边)三角形、直角三角形,在三角形中求线、角、面积。六、圆得有关线得长与面积。1、圆得周长、弧长C=2r,l=2、圆得面积、扇形面积、圆锥得侧面积与全面积S圆=r2,S扇形=,或 S扇形=(即 S扇形=)S圆锥=3、求面积得
10、方法直接法由面积公式直接得到间接法即:割补法(与差法)进行等量代换与 圆 有 关 得 计 算一、周长:设圆得周长为C,半径为r,扇形得弧长为l,扇形得圆心角为n、圆得周长:C R;扇形得弧长:。例题 1.(05 崇文练习一)某小区建有如图所示得绿地,图中 4 个半圆,邻近得两个半圆相切。两位老人同时出发,以相同得速度由A 处到 B 处散步,甲老人沿得线路行走,乙老人沿得线路行走,则下列结论正确得就是()(A)甲老人先到达B 处(B)乙老人先到达B 处(C)甲、乙两老人同时到达B 处(D)无法确定文档编码:CE7P2Z2H6P8 HN10Z7S9M10J4 ZT1B10Y7P7X1文档编码:CE
11、7P2Z2H6P8 HN10Z7S9M10J4 ZT1B10Y7P7X1文档编码:CE7P2Z2H6P8 HN10Z7S9M10J4 ZT1B10Y7P7X1文档编码:CE7P2Z2H6P8 HN10Z7S9M10J4 ZT1B10Y7P7X1文档编码:CE7P2Z2H6P8 HN10Z7S9M10J4 ZT1B10Y7P7X1文档编码:CE7P2Z2H6P8 HN10Z7S9M10J4 ZT1B10Y7P7X1文档编码:CE7P2Z2H6P8 HN10Z7S9M10J4 ZT1B10Y7P7X1文档编码:CE7P2Z2H6P8 HN10Z7S9M10J4 ZT1B10Y7P7X1文档编码:C
12、E7P2Z2H6P8 HN10Z7S9M10J4 ZT1B10Y7P7X1文档编码:CE7P2Z2H6P8 HN10Z7S9M10J4 ZT1B10Y7P7X1文档编码:CE7P2Z2H6P8 HN10Z7S9M10J4 ZT1B10Y7P7X1文档编码:CE7P2Z2H6P8 HN10Z7S9M10J4 ZT1B10Y7P7X1文档编码:CE7P2Z2H6P8 HN10Z7S9M10J4 ZT1B10Y7P7X1文档编码:CE7P2Z2H6P8 HN10Z7S9M10J4 ZT1B10Y7P7X1文档编码:CE7P2Z2H6P8 HN10Z7S9M10J4 ZT1B10Y7P7X1文档编码:
13、CE7P2Z2H6P8 HN10Z7S9M10J4 ZT1B10Y7P7X1文档编码:CE7P2Z2H6P8 HN10Z7S9M10J4 ZT1B10Y7P7X1文档编码:CE7P2Z2H6P8 HN10Z7S9M10J4 ZT1B10Y7P7X1文档编码:CE7P2Z2H6P8 HN10Z7S9M10J4 ZT1B10Y7P7X1文档编码:CE7P2Z2H6P8 HN10Z7S9M10J4 ZT1B10Y7P7X1文档编码:CE7P2Z2H6P8 HN10Z7S9M10J4 ZT1B10Y7P7X1文档编码:CE7P2Z2H6P8 HN10Z7S9M10J4 ZT1B10Y7P7X1文档编码
14、:CE7P2Z2H6P8 HN10Z7S9M10J4 ZT1B10Y7P7X1文档编码:CE7P2Z2H6P8 HN10Z7S9M10J4 ZT1B10Y7P7X1文档编码:CE7P2Z2H6P8 HN10Z7S9M10J4 ZT1B10Y7P7X1文档编码:CE7P2Z2H6P8 HN10Z7S9M10J4 ZT1B10Y7P7X1文档编码:CE7P2Z2H6P8 HN10Z7S9M10J4 ZT1B10Y7P7X1文档编码:CE7P2Z2H6P8 HN10Z7S9M10J4 ZT1B10Y7P7X1文档编码:CE7P2Z2H6P8 HN10Z7S9M10J4 ZT1B10Y7P7X1文档编
15、码:CE7P2Z2H6P8 HN10Z7S9M10J4 ZT1B10Y7P7X1文档编码:CE7P2Z2H6P8 HN10Z7S9M10J4 ZT1B10Y7P7X1文档编码:CE7P2Z2H6P8 HN10Z7S9M10J4 ZT1B10Y7P7X1文档编码:CE7P2Z2H6P8 HN10Z7S9M10J4 ZT1B10Y7P7X1文档编码:CE7P2Z2H6P8 HN10Z7S9M10J4 ZT1B10Y7P7X1文档编码:CE7P2Z2H6P8 HN10Z7S9M10J4 ZT1B10Y7P7X1文档编码:CE7P2Z2H6P8 HN10Z7S9M10J4 ZT1B10Y7P7X1文档
16、编码:CE7P2Z2H6P8 HN10Z7S9M10J4 ZT1B10Y7P7X1文档编码:CE7P2Z2H6P8 HN10Z7S9M10J4 ZT1B10Y7P7X1文档编码:CE7P2Z2H6P8 HN10Z7S9M10J4 ZT1B10Y7P7X1文档编码:CE7P2Z2H6P8 HN10Z7S9M10J4 ZT1B10Y7P7X1文档编码:CE7P2Z2H6P8 HN10Z7S9M10J4 ZT1B10Y7P7X1文档编码:CE7P2Z2H6P8 HN10Z7S9M10J4 ZT1B10Y7P7X1文档编码:CE7P2Z2H6P8 HN10Z7S9M10J4 ZT1B10Y7P7X1文
17、档编码:CE7P2Z2H6P8 HN10Z7S9M10J4 ZT1B10Y7P7X1文档编码:CE7P2Z2H6P8 HN10Z7S9M10J4 ZT1B10Y7P7X1文档编码:CE7P2Z2H6P8 HN10Z7S9M10J4 ZT1B10Y7P7X1文档编码:CE7P2Z2H6P8 HN10Z7S9M10J4 ZT1B10Y7P7X1文档编码:CE7P2Z2H6P8 HN10Z7S9M10J4 ZT1B10Y7P7X1例题 2.如图,ABC 就是正三角形,曲线 CDEF 叫做正三角形得“渐开线”,其中、得圆心依次按A、B、C 循环,将它们依次平滑相连接。如果 AB=1,试求曲线 CDEF
18、 得长。例题 3.(06 芜湖)已知如图,线段 AB CD,CBE=600,且 AB=60cm,BC=40cm,CD=40cm,O 得半径为 10cm,从 A到 D 得表面很粗糙,求O 从 A 滚动到 D,圆心 O 所经过得距离。例题4.如图,一个等边三角形得边长与与它得一边相外切得圆得周长相等,当这个圆按箭头方向从某一位置沿等边三角形得三边作无滑动旋转直至回到原出发位置时,则这个圆共转了()圈。A 4 B 3 C 5 D 3、56、例题 5.(08 大兴二模)如图,一个人握着板子得一端,另一端放在圆柱上,某人沿水平方向推动板子带动圆柱向前滚动,假设滚动时圆柱与地面无滑动,板子与圆柱也没有滑动
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