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Class 9 Maths NCERT Solutions Chapter 7 - Triangles

Class 9 Maths NCERT Solutions Chapter 7 - Triangles

Triangles
Definition:- Triangle is a plane figure surrounded by three line segments.  The symbol of Triangle is ∆.
Types of angle on the basis of sides
On the basis of Sides – there are three types of triangles
  • Equilateral Triangle: – In an equilateral triangle, all sides are equal.  In the below figure,  PQR is a triangle in which PQ=QR=PR, so it is an equilateral triangle.
Important topic of Chapter 7 - Triangles Class 9 Maths,9 clas maths, maths NCERT solutions class 9
  • Isosceles Triangle: -A triangle having two sides equal is called an isosceles triangle. In the below figure ABC is a triangle in which AB=AC, hence it is an isosceles triangle.
Important topic of Chapter 7 - Triangles Class 9 Maths, 9 clas maths, maths NCERT solutions class 9
  • Scalene triangle– A triangle in which all the sides are of different in size is called a scalene triangle. In the below figure DEF is a triangle in which no side is equal.
  • Perimeter of a triangle– The sum of lengths of three sides of a triangle is called its perimeter

Read full article click here.... Chapter 7 - Triangles- Class 9 maths

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