I faced one interview last week. In that interview, the interviewer asked a very basic question; but, it was out of my knowledge. He wanted to check my very basic mathematical skills, and wanted to see whether I am fond of mathematics or not.
The question was, what is pi?
The only thing I know of pi is that it equals $3.14$.
So, what is pi? From where this constant come? Why is the value $3.14$? As well as any other related questions that walk around this term "pi".
Waiting for your kind reply.