Determination of x,y values (in km) in an area with known Latitudes and Longitudes

How would I determine the x, y values of about 100 points in an area of 2 square kilometer (2 km2) if the latitudes and longitudes of these 100 points are known? The latitudes and longitudes of the centre of the square and the bounded four vertices are also known. The x, y origin (0, 0) of the square area is located at the lower left corner. [A picture is attached to describe the problem].

Answer 1

[KSSV]

Read about polyarea.

[Ikechukwu Ezeh]

@KSSV The 100 points are not situated at the edges of the square, but within the enclosed square area.

[KSSV]

Not a problem, arrange them into a closed polygon using: https://in.mathworks.com/matlabcentral/answers/400247-how-to-plot-closed-polygon-from-set-of-random-points-with-edges-not-intersecting

And then use polyarea. If you could do this thats good else attach your data.

[Ikechukwu Ezeh]

@KSSV Thanks for your answers.

But my concern is how to use known Latitudes and Longitudes of some points (in decimal degrees) to determine their corresponding x, y coordinates (in meters). A sample data is attached.

These points with known latitudes and longitudes are located in a 2 km2 (2 kilometer square). The center of the square has Latitude =- 6.51879500 and Longitude = 3.39911000. My concern is to find the x, y values of these Latitudes and Longitudes from x = 0 and y = 0.

[KSSV]

You can convert degrees into km using deg2km.