Is the red figure convex? What about the blue one? If you can't answer the first question, you need to study the definition of a convex set and read about examples of sets that are convex and not convex.
If this is the case (and note that I only want to say the following if you can't answer the first question), then it is unreasonable to believe that you can solve a problem without knowing the definition, and it would be a waste of time to involve other people in helping you to solve the problem.