I am starting with my question with the note "Assume no math skills". Given that, all down votes are welcomed. (At the expense of better understanding of course!)

Given my first question: What is meant by the perimeter of a Sector

- Why is the value of $\pi$ not exactly $3$? why is it $3.14$.......... or a fraction $\frac{22}{7}$?
- Is the value of $\pi$ of $3.14$... or $\frac{22}{7}$ the same as for $3$ dimensions?