标题: How many poles? [打印本页] 作者: ob 时间: 2004-11-4 22:53 标题: How many poles?
A farmer built a fence around his 25 cows in a square region. He built it in such a way that one can see 5 poles from either of the four sides. www.ddhw.com
What are the minimum number of poles the farmer must have used? www.ddhw.com
