Your code doesn't follow code convention or naming convention. Please check out this link: https://google.github.io/styleguide/javaguide.html . Your code should be clear and understandable for every developer. The code conventions help to reach this goal. N and result1 result2 there is a very bad naming.
Try to divide methods by logic into granular ones. It increases the readability of the code and helps other developers understand your code.
The formula to calculate square is side side, not side2.
Created Calculator program.