In geometry, the Perles configuration is a system of nine points and nine lines in the Euclidean plane for which every combinatorially equivalent realization has at least one irrational number as one of its coordinates. It can be constructed from some of the diagonals and symmetry lines of a regular pentagon, and their crossing points.
In geometry, the Perles configuration is a system of nine points and nine lines in the Euclidean plane for which every combinatorially equivalent realization has at least one irrational number as one of its coordinates. It can be constructed from some of the diagonals and symmetry lines of a regular pentagon, and their crossing points.
Source: Wikipedia "Perles configuration" · CC BY-SA 4.0
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