this post was submitted on 26 Oct 2025
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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!