bourgondian cross (I think)
Source: flanders '90
September 27, 2005
geometry
Problem Statement
On the standard unit circle, draw 4 unit circles with centers [0,1],[1,0],[0,-1],[-1,0].
You get a figure as below, find the area of the colored part.
http://www.mathlinks.ro/Forum/album_pic.php?pic_id=277