在我们学习平面几何学的时候,知道两个等积的直线图形,可以用拼割的方法使这两个图形合同。关于这一个问题,並不是一开始就容易理解的。例如一个三角形与另一个四边形等积的话,那末它们怎样能够变成合同的图形呢?校外的同志们也曾经来信问起这一个问题。现在我把过去的覆信的内容整理公布於後,还希望同志们给以指正。对於这个问题,首先我们要明确的是两个等积的直线图形。其次是把等积两个图形中的一个分割成几块刚巧能够铺满另一个图形的问题。现在下面要谈的就是怎样能够把等积的图形中的一个 When we study plane geometry, we know two equal-area straight-line graphs. We can use the spelling method to make these two graph contracts. It is not easy to understand this issue at the beginning. For example, if a triangle is equidistant with another quad, how can they become a contractual figure? The comrades outside the school once wrote a letter asking this question. Now that I have published the contents of the past cover letter, I also hope that the comrades will give me corrections. For this issue, the first thing we want to be clear is the straight plot of the two equal products. The second is the division of one of the equal parts of the two graphs into several problems that happen to be able to spread over the other graph. Now the next thing to talk about is how can one of the plots be equalized