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Introduction to Trigonometry

CBSE · Class 10 · Mathematics

Step-by-step guide to study Introduction to Trigonometry in CBSE Class 10 Mathematics. Topics to cover, practice strategy, and time allocation.

59 questions24 flashcards4 concepts

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Study Plan

1
Day 1–2

Learn the Theory

Read the textbook chapter carefully. Note down definitions, formulas, and key concepts.

2
Day 3

Practice Problems

Solve textbook exercises and additional practice questions. There are 59 questions available for this chapter.

3
Day 4

Revise & Test

Revise key formulas and concepts without looking at notes. Take a practice quiz to test your understanding. Mark weak areas for re-revision.

4
Day 7

Spaced Revision

Revisit Introduction to Trigonometry after a week. Use flashcards for quick recall. Solve previous year questions from this chapter.

What to Focus On

  • In a right triangle, the hypotenuse is always opposite the 90° angle and is the longest side.
  • The 'opposite' and 'adjacent' sides change depending on which acute angle you are considering.
  • Always identify the reference angle first, then label the sides accordingly.

  • SOH-CAH-TOA: Sin = Opp/Hyp, Cos = Adj/Hyp, Tan = Opp/Adj.
  • The three reciprocal ratios: cosec A = 1/sin A, sec A = 1/cos A, cot A = 1/tan A.
  • The quotient relations: tan A = sin A / cos A and cot A = cos A / sin A.

  • sin 30° = cos 60° = 1/2; sin 60° = cos 30° = √3/2 — these are complementary pairs.
  • sin 45° = cos 45° = 1/√2; tan 45° = 1 — the 45° triangle is isosceles.
  • tan 90° and sec 90° are NOT DEFINED (division by zero since cos 90° = 0).

Common Mistakes to Avoid

sin A means 'sin multiplied by A', so sin 2A = 2 × sin A

cosec A is the same as cos A (or that cosec = cos + something)

The trigonometric ratios depend on the size (length of sides) of the triangle, not just the angle

Memory Tips

Definition of sin, cos, tan using sides of a right triangle

cosec, sec, cot are reciprocals of sin, cos, tan respectively

tan A = sin A / cos A

Values of sin for 0°, 30°, 45°, 60°, 90°

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Frequently Asked Questions

What are the important topics in Introduction to Trigonometry for CBSE Class 10 Mathematics?
Introduction to Trigonometry covers several key topics that are frequently asked in CBSE 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 Introduction to Trigonometry — CBSE 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 Introduction to Trigonometry

All 14 chapters — CBSE Class 10 Mathematics Study Plan

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