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Introduction

Basic facts about triangles was presented by Euclid in his ‘Elements’ around 300 BC. A triangle is a polygon and a 2-simplex. 
 

Example : a 0-simplex is a point, a 1-simplex is a line segment, a 2-simplex is a triangle, a 3-simplex is a tetrahedron. All triangles are two-dimensional.

 

 

    

Real Life Examples for Triangles







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