Here goes a description of the input required for your program.
The program options can be displayed by running
python ./src/main.py -h
This will return the possible input options and type of parameters.
For example, to calculate the side length of a square with the same area as a circle of radius r, you would run
python ./src/main.py -o square -r 4
For the side length of a pentagon, you would provide
python ./src/main.py -o pentagon -r 4
The program will then return the side length of the selected object.