天气预报 > 其他 > 怎样用尺规做圆内接正5边形
怎样用尺规做圆内接正5边形
更新时间: 2020-07-06 00:00:00  

以O为圆心,定长R为半径画圆,作互相垂直的直径MN和AP;平分半径ON,得和OK=KN;以K圆心,KA为半径画弧与OM交于H,AH即为正五边形的边长;以AH为弦长,在圆周上截得ABCDE各点,顺次连接这些点即得正五边形。

关键词: 怎样

怎样用尺规做圆内接正5边形相关经验

天气预报

最新推荐

页面:/news/view-1817999/ | 耗时:0.2678 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=1817999 LIMIT 0,1
select * from tbl_Articles_data WHERE ArticleID=1817999 LIMIT 0,1
select * from tbl_Articles_sphinx where id=1817999 LIMIT 0,1
SELECT ArticleID,Title FROM tbl_Articles WHERE ArticleID IN(123856,1088578,1111248,1127509,244202,1094255,1082441,182229,311701,236868,1090338,1125955,1106459,2595124,1084093,2358056,216531,1108840,170334,1126348,1122256,1127775,1100187,1045499,1125101,1074630,136362,1092668,1373142,1128445) ORDER BY field (ArticleID,123856,1088578,1111248,1127509,244202,1094255,1082441,182229,311701,236868,1090338,1125955,1106459,2595124,1084093,2358056,216531,1108840,170334,1126348,1122256,1127775,1100187,1045499,1125101,1074630,136362,1092668,1373142,1128445)