Chapter 15 of 16
Revision Notes
Trigonometry — Revision Notes
Maharashtra Board · Class 9 · Mathematics
Trigonometry revision notes for Maharashtra Board Class 9 Mathematics: 4 topics in quick points. Includes Introduction to Trigonometry and Basic.
45 questions22 flashcards8 formulas & key relations5 concepts
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Key Topics to Revise
1
Introduction to Trigonometry and Basic Concepts
- Trigonometry helps measure distances and heights that cannot be measured directly
- It is based on right-angled triangles and uses Pythagoras theorem
- Similar triangles have proportional corresponding sides
2
Trigonometric Ratios
- Three basic trigonometric ratios: sine (sin), cosine (cos), and tangent (tan)
- Ratios remain constant for similar triangles with same angles
- Each ratio compares two sides of a right-angled triangle
3
Relations Among Trigonometric Ratios
- Complementary angle relationships: sin θ = cos(90° - θ)
- Basic identity: sin θ / cos θ = tan θ
- Product relationship: tan θ × tan(90° - θ) = 1
4
Trigonometric Ratios of Specific Angles
- Standard angles: 0°, 30°, 45°, 60°, 90°
- 30°-60°-90° triangle has sides in ratio 1 : √3 : 2
- 45°-45°-90° triangle has sides in ratio 1 : 1 : √2
Get complete notes with diagrams and examples
Full NotesKey Concepts
In a rightThree fundamental ratiosFor complementary angles (angles that addSpecific trigonometric values for 0°30°
Frequently Asked Questions
What are the important topics in Trigonometry for Maharashtra Board Class 9 Mathematics?
Key topics in Trigonometry include Introduction to Trigonometry and Basic Concepts, Trigonometric Ratios, Relations Among Trigonometric Ratios, Trigonometric Ratios of Specific Angles. Study these first, then practise questions on each for Class 9 exams.
How should I revise Trigonometry for Class 9 exams?
Learn the core ideas first, then work through the 45 practice questions on Trigonometry. 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.
More resources for Trigonometry
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