learn about : calculate area ,volume in autocad|| Quick section in autocad || Quick calculator in autocad.
In AutoCAD 2020 you can find the area of closed geometries in many ways, the most obvious one is using AREA command. Select Object from this prompt and click on the boundary of Rectangle AND Circle for which you want to find the area. The area of the object will visible above command line along with its perimeter or circumference.
To start Qickcalculator ,Right click in the drawing area and select QuickCalcalculator from the menu bar, you can also use its command by pressing ''CTRL+8'' .