The first time I came into contact with triangles was in the third grade of elementary school. The teacher said in the first class: "Triangles are the most stable shapes in the world!" Su Qin, who was only ten years old at the time, took note of it carefully.
Later, Su Qin discovered that what the teacher said was not necessarily right...
This article was first published on Baidu Tieba...
This is just a cheating little story, I will revise it slowly in the future!
Conception: