圆的知识点总结初三
今天为同学们整理的是【中考历史】人教版初中历史7-9年级知识点总结
本篇资料有点多，如果你需要下载word来打印学习
（如果资料对你有用，可以收藏－转发支持一下，我们会努力整理更多学习资料）
","gnid":"968baf0e598f532f6","img_data":[{"flag":2,"img":[{"desc":"","height":"1019","title":"","url":"https://p0.ssl.img.360kuai.com/t01c37fd9e823999c09.webp","width":"720"},{"desc":"","height":"1019","title":"","url":"https://p0.ssl.img.360kuai.com/t01a52842a48eb4bb75.webp","width":"720"},{"desc":"","height":"1019","title":"","url":"https://p0.ssl.img.360kuai.com/t01257b433d5bc57add.webp","width":"720"},{"desc":"","height":"1019","title":"","url":"https://p0.ssl.img.360kuai.com/t011f72747430389bd2.webp","width":"720"},{"desc":"","height":"1019","title":"","url":"https://p0.ssl.img.360kuai.com/t01b2f196b30a9396a7.webp","width":"720"},{"desc":"","height":"1019","title":"","url":"https://p0.ssl.img.360kuai.com/t0184464f0659ca9a68.webp","width":"720"},{"desc":"","height":"1019","title":"","url":"https://p0.ssl.img.360kuai.com/t01b1b75884d14b8473.webp","width":"720"},{"desc":"","height":"1019","title":"","url":"https://p0.ssl.img.360kuai.com/t010dd58e41b9a11771.webp","width":"720"},{"desc":"","height":"1019","title":"","url":"https://p0.ssl.img.360kuai.com/t01fa9a1007fae695a3.webp","width":"720"}]}],"original":0,"pat":"art_src_0,otherc,fts0,sts0","powerby":"hbase","pub_time":1686190612000,"pure":"","rawurl":"http://zm.news.so.com/720abaa93860d2ec537d9c83c1d48009","redirect":0,"rptid":"efffb4cbde62029d","rss_ext":[],"s":"t","src":"大凡","tag":[{"clk":"keducation_1:word","k":"word","u":""},{"clk":"keducation_1:人教版","k":"人教版","u":""}],"title":"人教版初中历史全册知识点总结（可打印）
束侍胡4584初三圆的重点知识 -
幸贱卞13217351786 ______ 4、弓形面积1) S弓形=S扇形-SΔOAB 2) S弓形=S扇形+SΔOAB 二、圆锥的侧面积和全面积1 把矩形ABCD绕直线AB旋转一周得到的图形叫做圆柱.旋转轴直线AB叫做它的轴. 2 在轴AB上的矩形的边AB的长度叫做它的高.平行于轴的边DC旋转而成...
束侍胡4584初三关于圆的知识 -
幸贱卞13217351786 ______ 很简单,用勾股玄定理和相似三角形原理,计算出C点到AB的距离就可以了,距离是4.8,一个公共点就是大于6小于8,两个公共点就是大于4.8小于6,相离就是大于8.
束侍胡4584初三的数学圆急求总结归纳的知识点 -
幸贱卞13217351786 ______ 初三数学圆知识点总结_百度文库 http://wenku.baidu.com/link?url=2rP32DSqW_tURO8lR0NLO63rr4Q79QvKJ-rm43Ncsrf027K9X2n5OE2-3l0EkDji7dZTsoNomAxKuMjjHYf-h2YlAJ8zN6AVCQ0knVIuj2O
束侍胡4584初三数学圆的知识 -
幸贱卞13217351786 ______ 两圆相切的话,圆心距=半径和=5+12=17cm 两圆相交的话,圆心距=√(5²+12²)=13cm
束侍胡4584数学 初三圆的知识
幸贱卞13217351786 ______ 阴影是不是大圆面积减去小圆面积 是9多少 9π吗 答案是C 过O做AB垂线,垂足D. 三角形ODB中,BD平方=OB平方-OD平方即大圆半径平方-小圆半径平方 所以得BD=3 所以AB=6 1、因为ABCD为平行四边形,根据对称性可知,AE=AF,且AC平分角C,则EFC为以AC为顶角平分线的等腰三角形,所以EF垂直AC,所以E与F必定处于以AC为直径,AC中点为圆心的圆上.... 2、同样,平行四边形对成性可以直接得到结论... PS:平行四边形对成性:当一个平行四边形被对角线分割成2个全等三角形时(比如AC),在2个三角形内做的任何对应相同的改变,得出的结论成立
束侍胡4584初三圆的知识 -
幸贱卞13217351786 ______ 从C向AB作垂线交AB于Z.设内切圆的直径是d, GC = x, EB = y BC = x + y CZ = d, ZB = 8-4 =4 CD = x + d/2 = 4, x = 4-d/2 AB = y + d/2 = 8, y = 8-d/2 x + y = 12 -d BCZ是直角三角形,d^2 + 4^2 = (x+y)^2 = (12-d)^2 解得d=16/3
束侍胡4584数学初三圆的知识
幸贱卞13217351786 ______ 正确结论:弧BD=弧CD 三角形ACB相似于三角形OEB、 连接DB,在三角形DEB中用勾股定理求出DB=2根号5 BEXCE=DEXAE 4X4=2AE AE=8 AD=10 在三角形ADB中运用勾股定理求出AB=4根号5 半径为2根号5
束侍胡4584关于圆的初中知识总结, -
幸贱卞13217351786 ______ 圆的有关性质 一,〖知识点〗圆、圆的对称性、点和圆的位置关系、不在同一直线上的三点确定一个圆、三角形的外接圆、垂径定理逆定理、圆心角、弧、弦、弦心距之间的关系、圆周角定理、圆内接四边形的性质 〖大纲要求〗 1. 正确理解和...
束侍胡4584求初三数学 圆这章知识点 -
幸贱卞13217351786 ______ 圆的特征:圆是由一条曲线构成的封闭图形,圆上任意一点到圆心的距离相等. 圆心和半径的作用:圆心决定圆的位置,半径决定圆的大小 . 圆是轴对称图形,直径所在的直线是圆的对称轴.圆有无数条对称轴 . 同一圆中直径是半径的2倍 ...
束侍胡4584初3数学(圆这一课时的知识点) -
幸贱卞13217351786 ______ “非直径”就是不是直径,如果这条弦是直径,那么不管它与另一条直径是否垂直,都会互相平分的,因为它们都过圆心.