椅子放稳问题另解

Another Way to Prove Whether a Chair Is Put on the Floor Steadily

关于椅子能否在地面上放稳的问题,以前建模的方法是用椅子脚与地面的距离来度量椅脚是否着地。这里采取另一种方法来证明椅子稍作挪动就可以使四只脚同时着地,即用椅腿与相应对角线的夹角来度量椅腿是否着地。

The topic whether a chair is put on the floor steadily is often be talked about. People used to measure the distance between the legs of the chair and the floor to judge whether the legs of the chair touched the floor. In this paper, another way is used to prove that the chair stands steadily by moving a little, which is to use the angle between the legs of the chair and the pertinent diagonal to judge whether the legs of the chair touch the floor.