First, addition

This method is to decompose an irregular figure into several basic regular figures, calculate their areas respectively, and then add them to find the area of the whole figure.

Second, subtraction.

This method regards the area of irregular figure as the difference of several basic regular figures.

Third, solve it directly

This method is based on the known conditions, and directly obtains the area of irregular graphics as a whole.

Fourth, the reorganization method

This method is to disassemble the irregular figure, reassemble it into a new figure according to the specific situation and the needs of calculation, and try to find out the area of this new figure.

Five, auxiliary line method

This method is to add one or more auxiliary lines to the graph according to the specific situation, so that the irregular graph can be transformed into several basic regular graphs, and then add and subtract to solve it.

Six, dig and fill method

This method is to cut off a part of the original national shape and fill another part in the figure to make it a basic regular figure, thus solving the problem.

VII. Translation Methods

This method is to cut a part of the graph and move it to an appropriate position in parallel, so that it can be combined into a new basic regular graph, which is convenient for calculating the area.

That's all I know so far. I need help.