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In your previous classes, you have studied about triangles and several properties
related to them. You have also learned that ‘tri’ refers to ‘three’, a triangle has three
sides, three vertices and three angles. In class 9 chapter 7, you’ll study about the
congruence of triangles, rules of congruence, inequalities in a triangle etc. in-detail.
‘Triangles’, is one of the most important chapters in the NCERT class 9 Maths syllabus,
in terms of weightage, as it carries 28 marks in total in class 9 final exam. Moreover, in-
depth knowledge of triangles is of great help in both professional and day to day life.
7.1 Introduction
7.2 Congruence of Triangles
7.3 Criteria for Congruence of Triangles
7.4 Some Properties of a Triangle
7.5 Some More Criteria for Congruence of Triangles
7.6 Inequalities in a Triangle
7.7 Summary
Section 7.2 In this section, you’ll learn about congruent figures. ‘Congruent’ means
‘equal’ in every respect. This section gives an introduction about the congruence of
triangles and some of their properties.
Section 7.3 – In this section, you’ll learn about two criteria for congruence of triangles
such as Side-Angle-Side (SAS) and Angle- Angle-Side (AAS).
Section 7.4 – Here you’ll acquire knowledge on some of the properties of a triangle
whose two sides are equal, based on the results of congruence of triangles.
Section 7.5 – You’ll learn about some more interesting criteria for congruence of
triangle such as Side-Side-Side (SSS) and Right angle – Hypotenuse – Side (RHS).
Section 7.6 – Here, you’ll learn about inequalities related to triangles. Studying about
inequalities helps us compare two or more objects or figures. Besides that, you’ll also
learn about relations between unequal sides and unequal angles of triangles.
Topics and sub-topics in this chapter are explained meticulously with theorems &
proofs, examples & solutions, and axioms. Solved examples are also given for better
understanding. To know more about the Class 9 Maths Chapter 7, you should explore
the exercises below. You can also download the NCERT Solutions for Class 9 Maths
Chapter 7 PDF, solved by expert maths trainers.
Published on 2020-01-29 09:34:20 by arunima. Last Modified on 2020-01-29 09:34:20
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