Class 9 Maths Triangles Introduction


Triangle is derived from word Tri meaning three & Angle, implies 3 angles. It is a closed figure formed by 3 intersecting lines. It has 3 sides, 3 angles, 3 vertices. In this chapter we will study Congruency of Triangles & some properties of Triangles.


Triangle is used in various fields

  1. Surveyor use it to find height of building
  2. It is used in construction of Bridge
  3. It is also used to build roof of the house
  4. Some Street sign broads are triangular
  5. It is used in Astronomy
  6. Also used in Carpentry & many other fields.

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