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Elementary school math problem: how to compare the sizes of two areas?
Method for comparing graphic regions

First, the method of square number

A figure with many squares is large, and vice versa.

Second, the overlapping method

Overlapping two graphs, it seems that which graph has a large surface area will have a large area.

Third, segmentation and replacement method.

A graphic is divided and then moved to form another graphic or similar graphic shape, and then compared.

Fourth, the spelling method (using two graphics to spell a graphic, the third graphic is larger.

Small)

Without calculating the graphic area, we can compare the areas of two graphics by the above method.