let t be an equilateral triangle whose sides are of length 1 unit .show that if any five points are

题目

let t be an equilateral triangle whose sides are of length 1 unit .show that if any five points are chosen lying on or insides the triangle ,then two of them must be no more than 1/2 unit

答案

一个边长为1的正三角形,在这个三角形边上或者内部任取2个点,是否这2个点的距离都不会大于1/2