Polyominoes are 2D geometric shapes made by "gluing" squares together along their edges. Dominos are one example. The wellknown game of Tetris uses tetromino shapes. Polyominoes generally do not count designs that are a reflection or flip of another shape. 


Block: only one arrangment  

Dominos: only one arrangment  


Triominoes: 2 arrangements  



Tetrominoes: 5 arrangements 

Pentominoes  how many arrangements? Extension questions: 
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