I don’t buy it. I don’t buy this explanation or this one.
So I made my own little blocks in Excel and copy/pasted them, moved them around, and, I didn’t pay too much attention to the joints lining up but, it’s obvious that the same blocks have two different areas. No matter how you count it, the area of the triangle is 5 blocks X 13 blocks / 2. And the area of the first is the same as the area of the second with one block missing. Using the same pieces.
There are no curves and the pieces are the same size and cover the same area minus one block.
I don’t get it.