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https://www.mathsisfun.com/puzzles/coun … ution.html
The solution on this page is not completely correct. The final solution, 64, is correct, but the actual steps have a couple errors.
Each section on these images are counted as 2, since they appear on either side of the triangle.
The green section in the first image and the blue section in the second image are therefore duplicates.
Instead of one of those, the actual section that completes the puzzle is here:
This triangle is completely missing from the posted solution.
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