Leidos Software Development Engineer interview questions

I have applied to the job online, I was given a call from the recruiter asked me a few questions if I am interested in the job opening, I have expressed my interested. The recruiter sent my resume to the hiring manager, shorty the recruiter told me that they will like to schedule an interview with the team. I have applied to the software developer job; the interview contains some technical and soft skill questions. From the technical question. 1. Explain OOP principles. They ask me about how to implement circle, square and rectangle in Object oriented programming. Also, to design a class diagram in paper.