Old Zhang's field is a rectangle, base 8 and height 5. His neighbour's field has the very same base and height — only the sides lean over. The neighbour boasts his field is bigger, because its sides are longer.老张有一块长方形的田，底 8 步、高 5 步。邻居把自家的田推得斜斜的——底和高一模一样，只是两条侧边斜了过去。邻居得意地说自己的田更大，因为边更长。