Equilateral Triangle

来源: 于 2004-01-17 09:52:00 [旧帖] [给我悄悄话] 本文已被阅读：次

A box has a hole of Equilateral Triangle. The side of the Equilateral Triangle is 1. The box has some coins in Equilateral Triangle shape. What is the minimum length of the side of a coin so that it cannot goes through the hole?