Hans Walser, [20090628a]
Puzzle
Except the squares, you can fill all polygons
by only two kinds of tiles.
The Puzzle
Grid may be helpful
Solution
Colored solution
Colors only
Next step
Reference
[Deshpande
2009] Deshpande,
M. N. : Proof Without Words: Beyond Extriangles. MATHEMATICS MAGAZINE. Vol. 82,
No. 3, June 2009, p. 208.