What is the formula for the area of a regular hexagon?

A regular hexagon can be considered as being built up of six equilateral triangles. Each equilateral triangle has an area of (b/2) * sqrt (3b/2) where b is the side of the equilateral triangles that make up the hexagon and also the radius of the hexagon's circumscribed circle, and sqrt means the square root of

So the area of the regular hexagon with side length b is 3 * b * sqrt (3b/2)