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In the Haochen CAD drawing software, it is relatively simple to calculate the area of 2D closed shapes, and the calculations are quite accurate. However, since CAD drawings contain many different types of shapes, the methods for calculating the area of each type vary. Therefore, in this article we will introduce methods for quickly querying and calculating the area in CAD. CAD commands and methods for quickly calculating area: For simple shapes composed of straight line segments, such as rectangles and triangles drawn with lines. Simply execute the area query command \"area(aa)\\" (which can be entered via the command line or by clicking the corresponding command icon). Once the command prompt appears, select the intersection points of the rectangle or triangle one after another and press Enter; CAD will then automatically calculate the final area and perimeter, displaying the results on the command line. For graphics composed of a single polyline or spline, such as circles, rectangles, or other two-dimensional closed shapes formed by polylines or splines. After executing the area calculation command, enter the O (Object) option as prompted and press Enter; then select the shape for which you want to calculate the values. CAD will automatically compute the area and perimeter. For polylines, the length and area are usually visible in the attribute box (Ctrl+1). Alternatively, in HaoChen CAD Architecture or HaoChen Cloud Architecture, execute the \"Calculate Area\" (cxmj) command and select \"Calculate area of closed curve\" to determine the area. For complex closed shapes composed of multiple lines, arcs, polylines, or splines, it is not possible to directly use query commands to calculate the area of the shape. First, use the Boundary (bo) command to create a boundary for an area. In the boundary dialog box, click the “Pick Point” button; by selecting a point within the enclosed area, it is possible to create a closed polyline or polygonal region (this can be specified in the boundary dialog box). For the generated polylines and regions, the area can be easily obtained either through the attribute box or by querying the area. 4. If the enclosed area is formed by multiple lines connected end to end, but there are other dividing lines or closed shapes within the area, we can convert the lines that form the boundary into closed polylines or regions. To convert a polyline, use the polyline editing tool PEDIT (PE); transform the boundaries into polylines and join them (J) to form a closed polyline ； To convert the lines into a region, use the “Region” command (which is available on the drawing toolbar); this will turn those lines into a region, after which the area can be determined using the property box or by performing a calculation. But this assumes that these lines are indeed connected end to end, with no intersections or obvious breaks. To quickly calculate the area in CAD, different commands must be used depending on the type of object. Simple lines, multi-segment lines, and complex shapes made up of arcs all require different approaches; the commands used for calculating the area of such shapes vary accordingly. The above is the tutorial on how to quickly calculate the area of graphics in CAD drawings using the HaoChen CAD drawing software. I hope it will be helpful to everyone~