https://www.quora.com/How-can-I-draw-a-triangle-with-three-9...
Also, taxicab geometry: https://en.m.wikipedia.org/wiki/Taxicab_geometry
https://www.quora.com/How-can-I-draw-a-triangle-with-three-9...
Also, taxicab geometry: https://en.m.wikipedia.org/wiki/Taxicab_geometry