One of the interviewers had a speech disorder and I could not understand some questions. In my opinion they should pick a person with a more perceptive speech to conduct the interviews. They asked me what I would do to validate a triangle. I began by answering that I would use the Pythagorean Theorem if it were a right triangle. They answered me "no" right away. How come I can not use the Pythagorean Theorem to validate a right triangle? I had the feeling that there was a lack of basic knowledge on the part of the interviewers.