Combine the two above squares on the left into the single large square on the right.
Pythagorean Square Puzzle
See also
Dissection, T-PuzzleExplore with Wolfram|Alpha
Cite this as:
Weisstein, Eric W. "Pythagorean Square Puzzle." From MathWorld--A Wolfram Web Resource. https://mathworld.wolfram.com/PythagoreanSquarePuzzle.html