From: rusin@vesuvius.math.niu.edu (Dave Rusin)
Newsgroups: sci.math
Subject: Re: Two interesting geometric problems
Date: 29 Jul 1998 07:02:05 GMT
wrote:
>
>1. You are given an infinite square grid of size L. At the origin of the grid
>stands an observer. At all the other grid points stands a tall tree of radius
>r (r