Monday, April 09, 2018

geometry problem fo' yo' ass

Here ya' go:

I wasn't able to solve this, but according to this video (click the link to see the solution; I watched the vid, so I now know the answer), a few Chinese 5th-graders solved the problem in under a minute. That in itself is a hint, by the way. If you solve the problem, leave your answer in the comments, and please show your work/reasoning.


Anonymous said...

I've gotten more stupid as I age. I could follow the explanation, but I doubt that the reputed Chinese fifth graders used the method shown. I suspect that if they did it in less than a minute, they didn't go through the formal methods shown.


Kevin Kim said...

I was thinking something similar. The only way to solve the problem in under a minute is to have (recently) memorized the specific geometric properties relevant to this particular problem. So I suspect that the math students had just done a unit on triangles and parallelograms and had this "quickie" method fresh in their minds.