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Chapter 4 Class 6 Basic Geometrical Ideas
Concept wise

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

It is a 3 sided polygon.

 

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

Here,

  • 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 is a graduate from Indian Institute of Technology, Kanpur. He has been teaching from the past 12 years. He provides courses for Maths and Science at Teachoo.