Triming Tri-Oddities
A triming is a plane figure formed by joining three
cells in the equilateral triangular grid along edges or at corners or both.
There are 11 tetramings, including the triamond, independent of reflection.
A tri-oddity
is a figure with ternary symmetry formed by joining a number of copies of
a polyform not a multiple of 3.
Here are the minimal known triming tri-oddities.
Please write if you find a smaller solution or solve the unsolved case.
See also Tetraming Tri-Oddities.
Impossible
Last revised 2026-10-16.
Back to Polyiamond and Polyming Oddities
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Polyform Curiosities
Col. George Sicherman
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