Translations and Reflections
Geometry
Level
pending
If two figures can be made to look the same by rotations or reflections, they are not unique. How many unique two-dimensional can be formed by fitting 4 congruent squares together so the adjacent square shares an entire edge? (Squares may not overlap)
The answer is 5.
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1 solution
These are the tetrominoes (specifically, free tetrominoes).