Tromino (source code)
= Tromino
= Triomino
{synonym}
= Triominoes
{synonym}
= Trominoes
{synonym}
A <tromino> is a <polyomino> made of three unit <squares> joined along whole sides. Up to <translation>, <rotation> and <reflection>, its two shapes are the straight three-square strip and the L shape. Their <area> is three, so a board tiled by <trominoes> must have <area> divisible by three; that condition alone need not ensure a <board tiling>. For example, a $2\times3$ <rectangle> admits two straight <trominoes>.
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