Triangle is made by joining any 3 non-collinear points.

It is a 3 sided polygon.



Polygon is a simple closed figure made of line segments


A triangle has

  3 vertices − A, B, C

  3 sides −     AB, BC, AC

  3 angles − ∠A, ∠B, ∠C


Interior and Exterior of a Triangle

Triangle - Part 2


  • P, Q are in interior of ∆ABC
  • R is on triangle ∆ABC
  • X, Y are in exterior of ∆ABC

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Davneet Singh

Davneet Singh has done his B.Tech from Indian Institute of Technology, Kanpur. He has been teaching from the past 13 years. He provides courses for Maths, Science, Social Science, Physics, Chemistry, Computer Science at Teachoo.