The question type is to subtract a length from the length and width of the square to find the remaining area. It is suggested that all questions be drawn ~

Because the title unit is not unified, it is suggested to unify the unit first ~ here it is unified as meter.

Solution: According to the meaning of the question, the original figure is square and the known area is 36 hectares, that is, 360,000 square meters (10000 square meters = 1 hectare).

According to the square area formula, the side length of a square is 800 meters.

So the length and width are reduced by 200 meters, and the length and width of the formed pattern are all 600 meters, so it is still square.

The square area after the change is 600 * 600 = 360,000 square meters (which can also be converted into hectares, that is, 36 hectares).

[Note: If the required unit is not given at the end of the question, you don't need to pay attention, otherwise you need to pay attention to the corresponding unit of the answer value]

A: The area of 64 hectares (square meters) is reduced by 200 meters in length and 200 meters in width, which is 36 hectares (360,000 square meters).

There are similar topics, such as a square (or one more step to find the side length of the square area), and then how many meters are added with the same drop, how many meters are added with the same drop, and how to find the drop or remaining area (pay attention to the problem ~). You may also be asked to find out the length of each length and width, and then meet the requirements of how much the area is changed/removed. Of course, there will also be long increases and reductions. It's best to make a sketch ~ easy to understand.

I hope mine can help you, thank you ~