如果你站着伸展双臂,那么你的臂展和你的身高差不多相当于一个正方形的两个边长。正方形有四条相等的边和四个相等的角。四下看看,你会发现更多的正方形——棋盘、饼干盒、瓷砖以及方形的窗玻璃。你家里的房间,要么是正方形,要么是长方形。你家所在的街道,可能是正方形街区的一部分。在古代岩画或者最早的原始文字体系中,正方形被用来代表房屋或住处。 If you stand with your arms outstretched, then your arm and your height are about the same size as two sides of a square. The square has four equal sides and four equal angles. Look around and you will find more squares - checkerboards, biscuit boxes, tiles and square windowpanes. Your home room, either square or rectangular. The street where your home is located may be part of a square block. In ancient rock paintings or the earliest original writing system, squares were used to represent houses or dwellings.