PLEASE CHECK THIS OUT. Our own Aeronmelon is going through some shit at the moment and could use some help. Check it out here and consider an upvote or a comment to push it into activity. Sorry, not something I do often or will be spamming. But I care about my friend and if I can get a couple more eyes on his situation then I’m going to try to do what I can.
You need the length of each edge. Probably some angles too. Make triangles. Double each triangle into a parallelogram. bh/2 for each one. Sum. Mostly just tedious because there are so many.
It’s only 3 pentagons, 1 hexagon, 1 triangle and 3 rectangles for a total of 20 component triangles. Easy!