天气预报 > 其他 > 椭圆通径是多少
椭圆通径是多少
更新时间: 2020-10-28 00:00:00  

椭圆通径公式d=2b^2/a。椭圆通径长定理,指的是椭圆的通径AB就是过焦点垂直于长轴的直线与椭圆相交所得的线段AB。可以由勾股定理推导。椭圆中的通径是通过焦点最短的弦。

椭圆(Ellipse)是平面内到定点F1、F2的距离之和等于常数(大于|F1F2|)的动点P的轨迹,F1、F2称为椭圆的两个焦点。其数学表达式为:|PF1|+|PF2|=2a(2a>|F1F2|)。

关键词: 椭圆 多少

椭圆通径是多少相关经验

天气预报

最新推荐

页面:/news/view-2845204/ | 耗时:0.7034 s | 内存:2.11 MB | 查询:4 | 缓存读取:3 写入:0 | 加载文件:25
select * from tbl_Articles WHERE ArticleID=2845204 LIMIT 0,1
select * from tbl_Articles_data WHERE ArticleID=2845204 LIMIT 0,1
select * from tbl_Articles_sphinx where id=2845204 LIMIT 0,1
SELECT ArticleID,Title FROM tbl_Articles WHERE ArticleID IN(1063929,1066118,1073322,1074618,1093989,1076764,1075482,1074272,1072403,1080759,1072591,1071199,1068150,1076452,1073568,1090663,1086608,911418,1094393,1069833,1091703,1053230,1086458,1068148,1075975,1065091,1062248,1091974,1069477,1064251) ORDER BY field (ArticleID,1063929,1066118,1073322,1074618,1093989,1076764,1075482,1074272,1072403,1080759,1072591,1071199,1068150,1076452,1073568,1090663,1086608,911418,1094393,1069833,1091703,1053230,1086458,1068148,1075975,1065091,1062248,1091974,1069477,1064251)