You are learning...

Chapter 7 Class 9 Triangles

Master Chapter 7 Class 9 Triangles with comprehensive NCERT Solutions, Practice Questions, MCQs, Sample Papers, Case Based Questions, and Video lessons.

Start Learning Now

Updated for new NCERT Books (for 2023-24 Exams)

NCERT Solutions of Chapter 7 Class 9 Triangles is available free at teachoo. Solutions to all exercise questions, examples and theorems is provided with video of each and every question.

 

Let's see what we will learn in this chapter. The topics in the chapter are - 

  • What is congruency of figures
  • Naming of triangles when two triangles are congruent
  • What is CPCT - Corresponding Parts of Congruent Triangles
  • SAS (Side Angle Side) Congruence Rule (this is without proof)
  • ASA (Angle Side Angle) congruence rule with proof (Theorem 7.1)
  • Is ASA and AAS congruency the same?
  • Angles opposite to equal sides is equal (Isosceles Triangle Property)
  • SSS (Side Side Side) congruence rule with proof (Theorem 7.4)
  • RHS (Right angle Hypotenuse Side) congruence rule with proof (Theorem 7.5)
  • Angle opposite to longer side is larger, and Side opposite to larger angle is longer
  • Triangle Inequality - Sum of two sides of a triangle is always greater than the third side

 

Click on an exercise link below to study from the NCERT Book.

Or click on a Concept link and study the Teachoo way.

Check it out now!

Serial order wise

Ex 7.1 Start Learning
Ex 7.2 Start Learning
Ex 7.3 Start Learning
Examples Start Learning
Theorems Start Learning
Angle opposite to longer side Start Learning
Important Triangle Questions Start Learning

Concept wise

Congruency - Introduction Start Learning
SAS Start Learning
ASA/AAS Start Learning
Opposite Angles of equal sides Start Learning
SSS Start Learning
RHS Start Learning
Side inequality Start Learning

Why Learn This With Teachoo?

Updated for new NCERT Books (for 2023-24 Exams)

NCERT Solutions of Chapter 7 Class 9 Triangles is available free at teachoo. Solutions to all exercise questions, examples and theorems is provided with video of each and every question.

 

Let's see what we will learn in this chapter. The topics in the chapter are - 

  • What is congruency of figures
  • Naming of triangles when two triangles are congruent
  • What is CPCT - Corresponding Parts of Congruent Triangles
  • SAS (Side Angle Side) Congruence Rule (this is without proof)
  • ASA (Angle Side Angle) congruence rule with proof (Theorem 7.1)
  • Is ASA and AAS congruency the same?
  • Angles opposite to equal sides is equal (Isosceles Triangle Property)
  • SSS (Side Side Side) congruence rule with proof (Theorem 7.4)
  • RHS (Right angle Hypotenuse Side) congruence rule with proof (Theorem 7.5)
  • Angle opposite to longer side is larger, and Side opposite to larger angle is longer
  • Triangle Inequality - Sum of two sides of a triangle is always greater than the third side

 

Click on an exercise link below to study from the NCERT Book.

Or click on a Concept link and study the Teachoo way.

Check it out now!