First definition of triangles from Euclidâ€™s Elements Book I (Fundamentals of Plane Geometry Involving Straight Lines), Definition 20.

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# Tag: triangles

## First Definition of Triangles

stuff that arises in my teaching of mathematics at the King's School Canterbury

First definition of triangles from Euclidâ€™s Elements Book I (Fundamentals of Plane Geometry Involving Straight Lines), Definition 20.