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Revision Notes

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?
Understand the core concepts first, then work through the 45 practice questions available for this chapter. Revise formulas and 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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All 16 chapters — Maharashtra Board Class 9 Mathematics Revision Notes

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