What is the greatest number of regions into which an equilateral triangle can be divided using exactly three straight lines..

问题描述:

What is the greatest number of regions into which an equilateral triangle can be divided using exactly three straight lines..

一个等边的三角形用3条直线最多可以分成多少个区域.
那你拿张纸画一下就好了,很简单的哇,我画下来是7块,不知道有没有错.