Hello Brian,

here is the node. It has also the long/short option which gives interesting results while playing:-) search for the blue node.
The formula is based on vectormath -> linear equation system -> -p/2 +/- Sqrt((p/2)^2-q) maybe useful for further experiments ???
By the way I put an updated info node here. I took Dinos volume script (stl -based) (thanks for sharing) and wrapped it in a node and a modified version for calculating areas of faces/surfaces.

Have a nice day
Karsten