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Basic geometry: language and labels | Introduction to Euclidean geometry | Geometry | Khan Academy
Courses on Khan Academy are always 100% free. Start practicing—and saving your progress—now: https://www.khanacademy.org/math/geometry/hs-geo-transformations/hs-geo-intro-euclid/v/language-and-notation-of-basic-geometry Before learning any new concept (mathematical or otherwise), it's important we learn and use a common language and label ...
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