The Euclidean metric is a way of measuring distance in a flat space, based on the familiar concepts of geometry that we learn in school. It defines the distance between two points in Euclidean space using the Pythagorean theorem, where the distance is computed as the square root of the sum of the squares of the differences in each coordinate. This metric is fundamental because it provides a standard way to describe geometric shapes and relationships in both two-dimensional and three-dimensional spaces.
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