天气预报 > 教育 > 圆的面积怎么求
圆的面积怎么求
更新时间: 2021-03-28 00:18:52  

1、圆的面积的公式是S=πr2(r—半径,d—直径,π—圆周率)

2、即圆的面积=半径×半径×圆周率。

3、把圆平均分成若干份,可以拼成一个近似的长方形。长方形的宽就等于圆的半径(r),长方形的长就是圆周长(C)的一半。长方形的面积是ab,那圆的面积就是:圆的半径(r)的平方乘以π。

关键词: 面积 怎么

圆的面积怎么求相关经验

天气预报

最新推荐

页面:/news/view-2111923/ | 耗时:0.0433 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=2111923 LIMIT 0,1
select * from tbl_Articles_data WHERE ArticleID=2111923 LIMIT 0,1
select * from tbl_Articles_sphinx where id=2111923 LIMIT 0,1
SELECT ArticleID,Title FROM tbl_Articles WHERE ArticleID IN(1061833,1072434,1091920,428907,1117996,643207,801525,1651044,1110033,1110211,731595,543960,1103010,1054651,3266707,698090,1085200,3460874,3417749,887870,1005204,1150513,772418,710170,3020874,558305,391356,1121212,928993,935607) ORDER BY field (ArticleID,1061833,1072434,1091920,428907,1117996,643207,801525,1651044,1110033,1110211,731595,543960,1103010,1054651,3266707,698090,1085200,3460874,3417749,887870,1005204,1150513,772418,710170,3020874,558305,391356,1121212,928993,935607)