Does anyone know if there is a way to get precise dimensions of a hexagon by starting with the distance between flat sides?

Example:

Say the distance between the top and bottom is 1.5 inches. How would I go about determining the dimensions of the rest of the hex?

I don't know a lot of math, so please explain in lay terms if possible. I'm trying to learn all I can about hexagons and determing dimensions.

Thank You,

Imp