天气预报15天查询> 其他> 四边形有几条直的边有几个角

四边形有几条直的边有几个角

更新时间: 2020-09-18 00:00:00     

有四条直的边,四个角。

由不在同一直线上的不交叉的四条线段依次首尾相接围成的封闭的平面图形或立体图形叫四边形,由凸四边形和凹四边形组成。顺次连接任意四边形上的中点所得四边形叫中点四边形,中点四边形都是平行四边形。菱形的中点四边形是矩形,矩形中点四边形是菱形,等腰梯形的中点四边形是菱形,正方形中点四边形就是正方形。

关键词: 四边形

如有意见、反馈、侵权或投诉等情况,请联系:

电话:
邮箱:

我们将会在48小时内给与处理!

版权所有 Copyright ? 2009-2020 tianqiyubao3.com

页面:/news/view-3006963/ | 耗时:0.3673 s | 内存:1.89 MB | 查询:4 | 缓存读取:4 写入:0 | 加载文件:23
select * from tbl_Articles WHERE ArticleID=3006963 LIMIT 0,1
select * from tbl_Articles_data WHERE ArticleID=3006963 LIMIT 0,1
select * from tbl_Articles_sphinx where id=3006963 LIMIT 0,1
SELECT ArticleID,Title FROM tbl_Articles WHERE ArticleID IN(1075423,1066020,1066090,1107851,1046566,1132489,1076029,1071119,1121734,1062566,1127481,1071137,1041343,1109719,1070963,1129001,1064119,1081061,1083133,1123092,1110982,1064613,1065928,1055758,1042066,1046928,1132115,1082980,1062973,1132739) ORDER BY field (ArticleID,1075423,1066020,1066090,1107851,1046566,1132489,1076029,1071119,1121734,1062566,1127481,1071137,1041343,1109719,1070963,1129001,1064119,1081061,1083133,1123092,1110982,1064613,1065928,1055758,1042066,1046928,1132115,1082980,1062973,1132739)