Chapter 6 of 16
Syllabus
Triangles — Syllabus
Maharashtra Board · Class 9 · Mathematics
What Triangles covers in Maharashtra Board Class 9 Mathematics: 4 topics, for the 2026-27 session. Topics include Remote Interior Angles Theorem.
45 questions25 flashcards2 formulas & key relations5 concepts
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4 Topics · Maharashtra Board Class 9 Mathematics · 2026-27
Topics in Triangles
1
Remote Interior Angles Theorem
- An exterior angle of a triangle equals the sum of its two remote interior angles
- Remote interior angles are the two angles of the triangle that are not adjacent to the exterior angle
- An exterior angle is always greater than either remote interior angle
2
Congruence of Triangles
- Two triangles are congruent if they have the same shape and size
- Congruent triangles have all corresponding sides and angles equal
- Four main tests for congruence: SAS, ASA, SSS, and Hypotenuse-Side test
3
Isosceles Triangle Theorems
- In an isosceles triangle, angles opposite to equal sides are equal
- If two angles of a triangle are equal, then sides opposite to them are equal
- These theorems are converses of each other
4
Special Right Triangles
- 30°-60°-90° triangle: sides are in ratio 1:√3:2
- 45°-45°-90° triangle: sides are in ratio 1:1:√2
- These ratios help in quick calculations without using trigonometry
Key Concepts
The measure of an exterior angleTwo triangles are congruent if theyIn an isosceles triangle30°A median connects a vertex
Work through every topic in Triangles with notes and quizzes
Start This ChapterFrequently Asked Questions
What are the important topics in Triangles for Maharashtra Board Class 9 Mathematics?
Key topics in Triangles include Remote Interior Angles Theorem, Congruence of Triangles, Isosceles Triangle Theorems, Special Right 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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