Lines of Symmetry for Regular Polygons

Each regular polygon has as many lines of symmetry as the number of _____. 

A polygon is said to be _____ if all of its sides are of equal length and all of its angles are of equal measures. 

How many lines of symmetry are there in a regular polygon of sides $8$?

How many lines of symmetry are there in a regular polygon of sides $5$?

How many lines of symmetry are there in a regular polygon of sides $3$?

Name the regular polygon having four sides. 

Name the polygon having the least number of sides.