1, the method of finding the combined graphic area:
(1) segmentation method: divide the graphics reasonably to form basic graphics, and the sum of the basic graphics areas is the area of the combined graphics. (summation method)
(2) Supplementary method: the missing part of the figure is supplemented to form several basic figures, and the basic figure area-supplementary figure area = combined figure area.
2. Estimation of irregular figure area:
(1) method of counting cells.
(2) Irregular figures are regarded as approximate basic figures, and the area is estimated.
The chicken and the rabbit are in the same cage;
1, list method.
2. Hypothetical method
3. Column equation
Law in lattice: ellipsis