回复:ZT:平面上7个点(3星)
jjmmjj
2009-07-03 06:52:26
( reads)
A. 3 points form a triangle with each edge of 1.
B. 4 points form a square with each edge of 1.
place A and B at a plane separated far enough that any point in one group to any point of another group is large than 1.