How can you name the sides and vertices of a polygon? - Answers

You can name them in any way you like. The four sides of a quadrilateral could be called John, Paul, George and Ringo if you like (and are old enough to know better). However, single characters are usually preferred: with lower case letters for the sides and upper case letters for vertices. You can use letters from any language, but Roman and Greek characters are preferred because they are more widely available in font sets. Numbers are not such a good idea because these are used for measures of length or angles.