Splain to Me
Where'd the Square Go...
Check the slope of the lines.
There is an angle point in the hypotenuse after rearrangement.
Yep, he cheats by not having the pieces lay flat on the grid. In the first picture the slope of the left triangle is 3/8 = 0.375 but the top triangle is 2/5 = 0.4, and it the second picture they are reversed so the kink goes the other way.
Was that a Sam Loyd puzzle? I recall Martin Gardner writing about him decades ago. I don't recall that he cheated that way, though, in the puzzles I saw.
(What a memory I have! But then I forgot to eat breakfast this morning.)
I am famous for both sides of my memory. On the one side I remember minute details from decades ago. On the other I can't remember your name though we were classmates in school for six years. It will come to me, but embarrassingly late.