Triangle, geometry, * * * nine angles. Triangle, triangle. Geometry, geometry? On the first floor, I explained this sentence, but I also answered it for my little brother. It's simple. It is a word game triangle: generally interpreted as "three angles". At the same time, this question "triangle" is a noun and can be understood as X geometry: generally interpreted as "how many". At the same time, this question "geometry" is a noun and can be understood as Y (just like: my name is "you", do you understand). So, the question is: X, Y * * is 90.