What is the formula for solving a polygon?

Could you please elaborate on the specific formula used to solve a polygon? Are you referring to calculating the area, perimeter, or perhaps finding the angles and sides of a polygon? It's important to clarify as there are different methods and formulas depending on the polygon's shape and the specific problem at hand. Additionally, could you specify if you're dealing with a regular or irregular polygon? Understanding these details will help me provide a more accurate answer tailored to your question.