I see that you've uploaded a math problem, and it seems to be in Vietnamese. Let me break it down:

The problem is about calculating areas and distances for a rectangular plot divided into smaller sections. Here’s a summary of what the problem asks:

Part a) Calculate the area of the square (presumably referring to the area of the main rectangular plot). Part b) Calculate the total area of the plots for growing vegetables. Part c) Find how many poles (cột gỗ) are needed to build a fence around the rectangular plot if the distance between each pole is 2 meters.

I’ll need to carefully interpret and work through each part. Should I start solving this now? Let me know if you want any part explained in more detail or if you’d like me to continue solving it step by step!