Chapter 7 of 12
Syllabus
Triangles — Syllabus
Gujarat Board · Class 9 · Mathematics
What Triangles covers in Gujarat Board Class 9 Mathematics: 4 topics, for the 2026-27 session. Part of the Gujarat Board Class 9 Mathematics syllabus.
44 questions22 flashcards5 concepts
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4 Topics · Gujarat Board Class 9 Mathematics · 2026-27
Topics in Triangles
1
Introduction to Triangles and Congruence
- A triangle is a closed figure formed by three intersecting lines with three sides, three angles, and three vertices
- In triangle ABC: sides are AB, BC, CA; angles are ∠A, ∠B, ∠C; vertices are A, B, C
- Congruent figures have the same shape and size - they can cover each other completely
2
SAS Congruence Rule
- SAS stands for Side-Angle-Side congruence rule
- Two triangles are congruent if two sides and the included angle of one triangle equal the corresponding parts of another
- The angle must be included between the two equal sides
3
ASA and AAS Congruence Rules
- ASA: Two angles and the included side are equal
- AAS: Two angles and any corresponding side are equal
- If two angles are equal, the third angle is automatically equal (angle sum = 180°)
4
Properties of Isosceles Triangles
- An isosceles triangle has two equal sides
- Angles opposite to equal sides are equal (Theorem 7.2)
- If two angles of a triangle are equal, the sides opposite to them are equal (Theorem 7.3)
Key Concepts
Two triangles are congruent if theyIf two sides and the includedIf two angles and the includedIf two angles and one correspondingIf all three sides of one
Work through every topic in Triangles with notes and quizzes
Start This ChapterFrequently Asked Questions
What are the important topics in Triangles for Gujarat Board Class 9 Mathematics?
Key topics in Triangles include Introduction to Triangles and Congruence, SAS Congruence Rule, ASA and AAS Congruence Rules, 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 44 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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