A ~20"x24" hexagon is indeed a regular hexagon (or close enough). Dividing the straws into six regular triangular regions 12" across the base, there are 5333 straws per region. 5333 is not a triangular number, but assuming this number is just a guesstimate, there would be somewhere between 102 and 103 straws along each edge of the triangle. This makes 8.5 straws per linear inch, or ~3mm outside diameter per straw.
Those are still really narrow straws, especially considering they’re also 10 inches long. I’ve never seen straws like that.
