Chapter 7 of 15
Syllabus
Triangles — Syllabus
Telangana Board · Class 9 · Mathematics
Triangles topics: Congruent Figures and Basic Concepts, SAS Congruence Axiom, ASA Congruence Rule, plus 1 more.
45 questions20 flashcards5 concepts
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4 Topics · Telangana Board Class 9 Mathematics · 2026-27
Topics in Triangles
1
Congruent Figures and Basic Concepts
- Two figures are congruent if they have the same shape and size
- Congruent triangles can be placed exactly over each other
- Corresponding Parts of Congruent Triangles (CPCT) are equal
2
SAS Congruence Axiom
- SAS stands for Side-Angle-Side congruence criterion
- The angle must be included between the two given sides
- This is taken as an axiom (accepted without proof)
3
ASA Congruence Rule
- ASA stands for Angle-Side-Angle congruence criterion
- The side must be included between the two given angles
- Can be proved using SAS axiom
4
Properties of Isosceles Triangles
- In an isosceles triangle, two sides are equal
- Angles opposite to equal sides are equal
- If two angles are equal, then sides opposite to them are equal (converse)
Key Concepts
Two figures are congruent if theyTwo triangles are congruent if twoTwo triangles are congruent if twoTwo triangles are congruent if allIn right triangles
Work through every topic in Triangles with notes and quizzes
Start This ChapterFrequently Asked Questions
What are the important topics in Triangles for Telangana Board Class 9 Mathematics?
Key topics in Triangles include Congruent Figures and Basic Concepts, SAS Congruence Axiom, ASA Congruence Rule, Properties of Isosceles Triangles. Study these first, then practise questions on each for Class 9 exams.
How should I revise Triangles for Class 9 exams?
Learn the core ideas first, then work through the 45 practice questions on Triangles. Revise definitions regularly and use flashcards for quick recall before the exam.
Sources & Official References
Content is aligned to the official syllabus. Refer to the board website for the latest curriculum.
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