Definition, types, formulas of triangles, Triangle Classification by Internal Angles, Triangle Classification by Length of Sides, Properties of Triangle: Summary and Key Takeaways, GMAT Geometry Concepts and Formulas on Triangles (Part-1), Properties of Triangles: Practice Questions (Part-2), Properties of Numbers: Even/Odd, Prime, and HCF & LCM, GMAT Syllabus 2020 - Section wise details for Quant, Verbal, IR, AWA. The corners outside the triangle … Due to this, the three angles are also different from each other. It has three vertices, three sides and three angles. It uses lines, line segments or rays (in any combination) to form the three sides. 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