8 triangles puzzle by Jan Aarts.

thingiverse

Ionica Smeets recently shared this puzzle on Twitter. https://twitter.com/ionicasmeets/status/1048490206477910016 There are four identical triangles and four different triangles. Use all eight triangles to form * Three triangles * Two triangles * One triangle * One rectangle I had fun for a few minutes solving the first three challenges, but it took me much longer to complete the last one. Spoiler alert: A quick glance at the OpenSCAD file won't reveal the solutions, but they are included. You can download this, use it to 3D print the pieces, laser-cut the pieces or simply print it on cardboard and cut it out. Jan Aarts created this puzzle. Unfortunately, I couldn't find an English Wikipedia page about him, so here's the Dutch version. https://nl.wikipedia.org/wiki/Johannes_Michael_Aarts In the OpenSCAD model, I changed the color of the rotated and mirrored triangles slightly to make the solutions more visible. Since I used the same rotated versions for the suggested laser-cut layout, they appear colored as well. If you plan to laser-cut it from acrylic, consider using two different colors for the two distinct triangles. They are grouped into two mostly rectangular areas to facilitate efficient cutting from a scrap piece of acrylic. Alternatively, cut the entire puzzle from two colors of acrylic to create two complementary puzzles. The 75mm scale factor works perfectly for me.