n. [数]长方形，矩形
变形：形容词：rectangular；
1、Suppose the width of a rectangle is x metres.
设长方形的宽是x米.
2、He handed me a little rectangle of white paper.
他递给我一张小小的长方形白纸片。
3、A squared rectangle is a rectangle dissected into at least two squares.
方化矩形是指可以分割成至少两个正方形的矩形.