Polygon Area Calculator is a free Android application developed by kornjakov.ru. It falls under the category of Utilities & Tools and offers users the ability to build a graphic image of a polygon, set the exact values of its coordinates, and calculate various properties of the polygon such as area, dimensions of sides, angles, and perimeter.

The program provides multiple methods for creating a polygon. Firstly, users can add and move points directly on the graphic scheme. They can also choose a sample polygon from a list and modify it accordingly on the scheme. For precise point coordinates, users can utilize the coordinate editor.

Secondly, users can load an image of a surface, such as the boundaries of a land plot, and combine it with a polygon. They can set the scale of the grid based on known characteristic points and align the polygon points with the points in the photo.

Lastly, users can load a file or manually enter new points in the "List of points" table. The list of points can be imported from a CSV, TXT file, or copied from the clipboard. For example, users can download the coordinates of a land plot and obtain its dimensions. The program supports the use of the zonal coordinate system for displaying land plots.

Polygon Area Calculator offers a convenient and efficient way to calculate and visualize polygon properties. Whether it's for land surveys, architectural designs, or educational purposes, this application proves to be a valuable tool for users in need of accurate polygon measurements.