Mô hình thùng đựng nước bằng giấy

Hello everyone, today I would like to introduce you to a math lesson that I have taught in class. The math lesson is as follows, a 2x3 meter rectangle is folded in two ways. The first way is to fold this rectangle at a height of 2 meters. The second way is to divide this rectangle into two parts and fold it into two water bottles, also at a height of 2 meters. The question is to calculate the numerical value of the first box and the second box. With this math lesson, you can prepare the A4 paper because the A4 paper has a similar size, 2x3. The first way is to fold the A4 paper. The second way is to divide the A4 paper into two parts and fold it into two water bottles, also at a height of 2 meters. The question is to calculate the numerical value of the first box and the second box. With this math lesson, you can prepare the A4 paper because the A4 paper has a similar size, 2x3. The first way is to fold the A4 paper. The second way is to divide the A4 paper into two parts and fold it into two water bottles, also at a height of 2 meters. The question is to calculate the numerical value of the first box and the second box. With this math lesson, you can prepare the A4 paper because the A4 paper has a similar size, 2x3.