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Pick's theorem
Formula for area of a grid polygon / From Wikipedia, the free encyclopedia
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In geometry, Pick's theorem provides a formula for the area of a simple polygon with integer vertex coordinates, in terms of the number of integer points within it and on its boundary. The result was first described by Georg Alexander Pick in 1899.[2] It was popularized in English by Hugo Steinhaus in the 1950 edition of his book Mathematical Snapshots.[3][4] It has multiple proofs, and can be generalized to formulas for certain kinds of non-simple polygons.
For the theorem in complex analysis, see Schwarz lemma § Schwarz–Pick theorem.
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