As an Olympic math problem, there is no solution, because the straight line has no thickness. Moreover, you can prove from the angle of the sum of the internal angles that this diagram cannot be divided into two triangles. No matter who wrote it, even if it was written by a master of mathematics, it was thoughtless.

However, as a brain teaser, it is to draw a line thick enough. However, if you think too much, people will become stupid!

PS: Seeing that many people are still paying attention to this issue, I might as well say a few more words:

The definition of 1. line is not very clear. When teaching primary school students, two points are emphasized: first, they can extend to both ends indefinitely, and there is no objection to this; The other is that it has no thickness, emphasizing how thin it should be, not how thick it should be! This is a positive understanding of the straight line. More controversy about the definition of straight line is not good for primary school students. Mathematicians have said that every different definition of a straight line corresponds to a different geometric system.

2. I also played with players who drew a line thick enough: I accidentally drew a straight line as thick as the whole universe. God, I'm standing on this straight line now, and I can't see the sun or the earth. I want to go home, master, help me. ......