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Concept Maps

Trigonometry — Concept Maps

Tamil Nadu Board · Class 9 · Mathematics

3 concept maps of Trigonometry for Tamil Nadu Board Class 9 Mathematics, each also written out as a text outline.

45 questions30 flashcards4 formulas & key relations5 concepts

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A labeled diagram of a right-angled triangle showing the perpendicular, base, and hypotenuse relative to an acute angle, and defining the six trigonometric ratios (sine, cosine, tangent, cosecant, sec
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An illustration from Super Tutor's Trigonometry chapter — alongside flashcards, concept maps and practice questions.

3 Concept Maps

Trigonometry - Complete Chapter Overview

Trigonometry - Complete Chapter Overview

The map in words

  • root((Trigonometry
  • Class 9))
    • Basic Ratios
      • sin = Opp / Hyp
      • cos = Adj / Hyp
      • tan = Opp / Adj
      • Memory SOH-CAH-TOA
    • Reciprocal Ratios
      • cosec = 1 / sin
      • sec = 1 / cos
      • cot = 1 / tan
      • Products equal 1
    • Special Angles
      • 0 degrees
      • 30 degrees
      • 45 degrees
      • 60 degrees
      • 90 degrees
    • Complementary Angles
      • Sum equals 90 degrees
      • sin = cos of complement
      • tan = cot of complement
      • sec = cosec of complement
    • Trig Tables
      • Structure 0 to 90 degrees
      • Minutes and seconds
      • Mean Difference
      • Add for sin and tan
      • Subtract for cos

Trigonometry Concepts Overview

Trigonometry Concepts Overview

The map in words

  • Trigonometry
    • Basic Ratios
      • Sine theta
        • opposite/hypotenuse
      • Cosine theta
        • adjacent/hypotenuse
      • Tangent theta
        • opposite/adjacent
    • Reciprocal Ratios
      • Cosecant theta
        • 1/sin theta
      • Secant theta
        • 1/cos theta
      • Cotangent theta
        • 1/tan theta
    • Special Angles
      • 0 degrees
      • 30 degrees
      • 45 degrees
      • 60 degrees
      • 90 degrees
    • Complementary Angles
      • Sum equals 90
      • sin theta = cos(90-theta)
      • tan theta = cot(90-theta)
    • Trigonometric Tables
      • Reading values
      • Mean differences
      • Interpolation
    • Applications
      • Heights and distances
      • Angle calculations
      • Real world problems

Flowchart showing the three types of sides in a right-angled triangle and how they relate to the chosen angle

Flowchart showing the three types of sides in a right-angled triangle and how they relate to the chosen angle

The map in words

  • Right-Angled Triangle
    • Three Sides
      • Hypotenuse Longest side Opposite right angle
      • Opposite Side Opposite to angle θ
      • Adjacent Side Next to angle θ Not hypotenuse
  • Choose an angle θ

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Frequently Asked Questions

What are the important topics in Trigonometry for Tamil Nadu Board Class 9 Mathematics?
Key topics in Trigonometry include Introduction to Trigonometric Ratios, Reciprocal Trigonometric Ratios, Trigonometric Ratios of Special Angles (0°, 30°, 45°, 60°, 90°), Trigonometric Ratios of Complementary Angles. Study these first, then practise questions on each for Class 9 exams.
What do the concept maps for Trigonometry show?
The 3 maps show how the ideas in Trigonometry connect: Trigonometry - Complete Chapter Overview; Trigonometry Concepts Overview. Each map is also written out as an outline on this page.
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

All Tamil Nadu Board Class 9 Mathematics Concept Maps

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