I have absolutely no idea how to do a problem involving a hexagon.

The question gives me the surface area formula of a hexagon. I'll do my best to type it up:

SA= 6sh + 1.5s[squared] ( [squareroot]3 - cos[theta] [over] sin[theta] )

s= side length h=height theta= that 0 with a line in the middle

It asks me for the values of theta that will give the minimum and maximum surface area. I honestly have no idea-- my teacher never taught our class anything about this. Ever. Yes, it is the correctly assigned problem, and not a mistake or anything. Any help would be appreciated. Thanks.