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Revision Notes

Trigonometry

Kerala Board · Class 10 · Mathematics

Quick revision notes for Trigonometry — Kerala Board Class 10 Mathematics. Key concepts, formulas, and definitions for last-minute revision.

45 questions22 flashcards5 concepts

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Key Topics to Revise

1

Special Right Triangles and Their Properties

  • In a 45°-45°-90° triangle, both shorter sides are equal and the hypotenuse is √2 times the shorter side
  • In a 30°-60°-90° triangle, sides are in the ratio 1 : √3 : 2
  • These ratios remain constant regardless of the triangle's size
2

Trigonometric Ratios - Definitions and Basic Values

  • Sine (sin) = Opposite side / Hypotenuse
  • Cosine (cos) = Adjacent side / Hypotenuse
  • Tangent (tan) = Opposite side / Adjacent side
3

Standard Trigonometric Values

  • sin 0° = 0, sin 30° = 1/2, sin 45° = 1/√2, sin 60° = √3/2, sin 90° = 1
  • cos 0° = 1, cos 30° = √3/2, cos 45° = 1/√2, cos 60° = 1/2, cos 90° = 0
  • tan 0° = 0, tan 30° = 1/√3, tan 45° = 1, tan 60° = √3, tan 90° = undefined
4

Heights and Distances - Problem Solving

  • Most problems involve finding height of objects (trees, buildings, towers)
  • Key elements: observer's height, distance from object, angle of elevation/depression
  • Always draw a clear diagram showing all given information

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Full Notes

Key Concepts

In 45°sin θ = opposite side/hypotenusecos θ = adjacent side/hypotenusetan θ = opposite side/adjacent sideAngle of elevation is measured upward

Frequently Asked Questions

What are the important topics in Trigonometry for Kerala Board Class 10 Mathematics?
Trigonometry covers several key topics that are frequently asked in Kerala Board Class 10 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 — Kerala Board Class 10 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.

More resources for Trigonometry

All 13 chapters — Kerala Board Class 10 Mathematics Revision Notes

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