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Trigonometry

Maharashtra Board · Class 9 · Mathematics

Quick revision notes for Trigonometry — Maharashtra Board Class 9 Mathematics. Key concepts, formulas, and definitions for last-minute revision.

45 questions22 flashcards5 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

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Full Notes

Key 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?
Trigonometry covers several key topics that are frequently asked in Maharashtra Board Class 9 board exams. Focus on the core concepts listed on this page and practise related questions to build confidence.
How to score full marks in Trigonometry — Maharashtra Board Class 9 Mathematics?
Start by understanding all key concepts. Practise previous year questions from this chapter. Revise formulas and definitions regularly. Use flashcards for quick revision 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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All 16 chapters — Maharashtra Board Class 9 Mathematics Revision Notes

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