Euclidean geometry
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Euclidean geometry is a mathematical system that was developed by the ancient Greek mathematician Euclid, which describes the properties and relationships of shapes, lines, and spaces in flat, two- and three-dimensional environments. It matters because it provided a foundational framework for understanding space and shapes that has been used in mathematics, science, and practical applications like construction and engineering for over two thousand years.
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Detail from Raphael's The School of Athens featuring a Greek mathematician – perhaps representing Euclid or Archimedes – using a compass to draw a geometric construction.
Three-dimensional