What are the practical problems of finding area by the cut and fill method

Land surveying problems, construction problems.

1, land surveying problems: in land surveying, often encountered a variety of irregular land shapes, such as triangles, trapezoids, circles, etc., through the cut-and-complement method, you can convert these irregular shapes into rectangles, parallelograms and other easier to calculate the area of the shape.

2, building problems: in building design or construction, often need to calculate the area of various shapes, such as windows, doors, roofs, etc., the use of cut-and-complement method can be converted to these complex shapes into simple rectangles or triangles, so as to quickly calculate the area.